A commonly used earthquake scale is the surface wave magnitude scale, or MS, which measures the largest deflection of the needle on the seismograph for a surface wave that takes about twenty seconds to pass a point (which is about the same frequency as some ocean waves). The magnitude scale most useful to professionals is the moment magnitude ...In 1932 Charles Richter devised the first magnitude scale for measuring earthquake size. This is commonly known as the Richter scale. Richter used observations of earthquakes in California to determine a reference event; the magnitude of an earthquake is calculated by comparing the maximum amplitude of the signal with this reference event at a ...The most devastating of these was the 2015 earthquake, measuring 7.8 on the Richter scale, and its aftershocks, which claimed around 9,000 lives. Nepal is ranked as the 11th most earthquake-prone ...TheExtinctionProtocol.com March 23, 2012 ISRAEL – An earthquake measuring 3.7 on the Richter scale shook the Dead Sea area and was felt as far away a... Log In; RevolutionRadio.org. Your Weapon of Mass Destruction ... Earthquake hits Dead Sea region, felt in Jerusalem. Friday, March 23, 2012.Moment magnitude scale. The moment magnitude scale ( MMS; denoted explicitly with Mw or Mw, and generally implied with use of a single M for magnitude [1]) is a measure of an earthquake 's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori.Earthquake intensity is most often measured using the modified Mercalli scale, which was invented by the Italian geologist Giuseppi Mercalli in 1902 and uses Roman numerals from I to XII. In the United States, we use the modified Mercalli scale, which was adjusted to account for differences in buildings between Italy and southern California.Most earthquakes occur at fault zones, ... A quake measuring 3 to 4.9 is considered minor or light; 5 to 6.9 is moderate to strong; 7 to 7.9 is major; and 8 or more is great.Measuring the size of an earthquake. January 1, 1989. Earthquakes range broadly in size. A rock-burst in an Idaho silver mine may involve the fracture of 1 meter of rock; the 1965 Rat Island earthquake in the Aleutian arc involved a 650-kilometer length of the Earth's crust. Earthquakes can be even smaller and even larger. Earthquake detection. A seismogram is a record of the ground motions caused by seismic waves from an earthquake. A seismograph or seismometer is the measuring instrument that creates the seismogram. Almost all seismometers are based on the principle of inertia, that is, where a suspended mass tends to remain still when the ground moves.An earthquake measuring 5.3 on the Richter scale hit Nepal's Kathmandu on Sunday. Dramatic visuals during the tremors has went viral on the internet. ... a devastating 7.8 magnitude earthquake and ...San Francisco earthquake of 1989, major earthquake that struck the San Francisco Bay Area, California, U.S., on October 17, 1989, and caused 63 deaths, nearly 3,800 injuries, and an estimated $6 billion in property damage. It was the strongest earthquake to hit the area since the San Francisco earthquake of 1906.Because of the unique geologic setting of each earthquake and because the rupture area is often hard to measure, estimates of moment magnitude can take days to months to calculate. (9 Crustal Deformation and Earthquakes – An Introduction to Geology, n.d.) Like the Richter magnitude, the moment magnitude scale is logarithmic. Aug 24, 2021 ... New technologies that detect motion in the Earth's crust are emerging in surprising places and reshaping our understanding of earthquakes.The magnitude ("size") of an earthquake is based on the measurement of the maximum motion recorded by a seismograph. Several scales of measurement have been developed. The most familiar of these is the Richter scale - related to the size of seismic waves produced during a quake. However, today seismologists more commonly rely on what is ...An aftershock measuring 4.3 magnitude occurred at 8.08 am followed by 4.3 at 8.28 am and 4.1 at 8.59 am, according to Earthquake Measurement Centre. The quake …10-15. 8.0 or greater. Great earthquake. Can totally destroy communities near the epicenter. One every year or two. Modified Mercalli Intensity Scale. Top. Magnitude scales can be used to describe earthquakes so small that they are expressed in negative numbers. The scale also has no upper limit.Earthquake - Seismic Waves, Properties, Geology: At all distances from the focus, mechanical properties of the rocks, such as incompressibility, rigidity, and density, play a role in the speed with which the waves travel and the shape and duration of the wave trains. The layering of the rocks and the physical properties of surface soil also affect wave characteristics. In most cases, elastic ...This means that an earthquake will have only 1 Magnitude reading, but will have several shindo measurements. The degree of shaking will vary depending on how ...Magnitude is a measure of the amplitude (height) of the seismic waves an earthquake’s source produces as recorded by seismographs. Seismologist Charles F. Richter created an earthquake magnitude scale using the logarithm of the largest seismic wave’s amplitude to base 10.Earthquake size, as measured by the Richter Scale is a well known, but not well understood, concept. The idea of a logarithmic earthquake magnitude scale was first developed by Charles Richter in the 1930's for measuring the size of earthquakes occurring in southern California using relatively high-frequency data from nearby seismograph stations.Earthquake - Magnitude, Seismology, Epicenter: Earthquake magnitude is a measure of the “size,” or amplitude, of the seismic waves generated by an earthquake source and recorded by seismographs. (The types and nature of these waves are described in the section Seismic waves.) Because the size of earthquakes varies enormously, it is necessary for purposes of comparison to compress the range ...May 29, 2023 ... The power of an earthquake is expressed in terms of a magnitude on a scale called the Richter scale. It is measured in Richter scale.If the application does not load, try our legacy Latest Earthquakes application. USGS Magnitude 2.5+ Earthquakes, Past Day 37 earthquakes. Only List Earthquakes Shown on Map . Magnitude. Format. Newest First. Sort. 3.2. 11 km NE of Pāhala, Hawaii. 2023-10-19 20:09:13 (UTC-07:00) 31.3 km . 4.6 ...An earthquake measuring 5.3 on the Richter scale hit Nepal's Kathmandu on Sunday. ... Nepal frequently experiences earthquakes because it is located on the fault line where the Tibetan and Indian ...For example, the magnitude 6.9 1994 Northridge earthquake, which resulted in severe damage in the Los Angeles, area, was caused by between two and four meters of slip on a fault measuring about 12 ...The Bee spoke to seismologist Dr. Julian Lozos, an earthquake physicist and associate professor at California State University Northridge about what triggers an earthquake and how they are measured. -- Sacramento BeeEarthquake size, as measured by the Richter Scale is a well known, but not well understood, concept. The idea of a logarithmic earthquake magnitude scale was first developed by Charles Richter in the 1930's for measuring the size of earthquakes occurring in southern California using relatively high-frequency data from nearby seismograph stations.See full list on earthquakeauthority.com Normally, moderate earthquake are measured in Richter scale (Ml) which is directly proportional to the logarithm of amplitude of largest seismic wave recorded.Earthquake size, as measured by the Richter Scale is a well known, but not well understood, concept. The idea of a logarithmic earthquake magnitude scale was first developed by Charles Richter in the 1930's for measuring the size of earthquakes occurring in southern California using relatively high-frequency data from nearby seismograph stations.is a measure of the amount of energy released during an earthquake 3. The location where the earthquake starts below the earth's surface is called the ..... and the location directly above it on the earth's surface is called the 4. ..... are the most frequent type of natural disaster and occur when an overflow of water submerges land that is ...M = 32 log(S0S). One earthquake has magnitude 3.9 on the MMS scale. If a second earthquake has 750 times as much energy as the first, find the magnitude of the second quake. Round to the nearest hundredth. algebra2. use the Richter scale. R = log I/I0 R= logI /I 0. for measuring the magnitude R of an earthquake.Although often confused, they each measure different characteristics of an earthquake. Magnitude measures the amount of seismic energy released at the source - or hypocenter - of an earthquake. An earthquake has only one magnitude determined from measurements on seismographs. The first widely-used measurement was the Richter scale.May 29, 2023 · If 2 earthquakes measure 4 and 6 on the richter scale,it does not mean that second earthquake is 1.5 times first earthquake It actually means that it is 1000 times the first earthquake Seismograph It is an equipment used to measure seismic waves of an earthquake It has a vibrating rod or pendulum which is attached to a pen The largest recorded earthquake in history was the so-called "Great Chilean Earthquake" or "Valdivia Earthquake" which occurred on May 22, 1960 near Valdivia, in southern Chile. It had a magnitude of 9.5, which is also near the largest theoretically possible value. It accounts for about 30% of the total seismic energy released on earth …Measuring the size of an earthquake. January 1, 1989. Earthquakes range broadly in size. A rock-burst in an Idaho silver mine may involve the fracture of 1 meter of rock; the 1965 Rat Island earthquake in the Aleutian arc involved a 650-kilometer length of the Earth's crust. Earthquakes can be even smaller and even larger.3m ago. Major League Soccer introduced a temporary measure last week prohibiting fans attending matches from bringing signs, banners, flags or Tifos that …Largest earthquakes, significant events, lists and maps by magnitude, by year, or by location. Compilations of information about significant earthquakes, swarms or sequences, and fault zones of interest. USGS and non-USGS collections of earthquake-related features and effects and shaking damage.May 4, 2022 ... The magnitude of an earthquake is quantitatively measured using the Richter scale developed by Charles Richter in 1935. The Richter scale ranges ...Earthquake magnitude ratings. Scientists assign a magnitude rating to earthquakes based on the strength and duration of their seismic waves. A quake …How much bigger is a magnitude 8.7 earthquake than a magnitude 5.8 earthquake? An explanation of the magnitude of an earthquake versus the strength, or energy release, of an earthquake... with a little bit of math. How much bigger is a magnitude... TheExtinctionProtocol.com March 23, 2012 ISRAEL – An earthquake measuring 3.7 on the Richter scale shook the Dead Sea area and was felt as far away a... Log In; RevolutionRadio.org. Your Weapon of Mass Destruction ... Earthquake hits Dead Sea region, felt in Jerusalem. Friday, March 23, 2012.Earthquake epicenters occur mostly along tectonic plate boundaries, and especially on the Pacific Ring of Fire. An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth 's lithosphere that creates seismic waves.14 hours ago · Lucknow: Tremors shook many parts of eastern and central Uttar Pradesh, including Lucknow, early on Sunday morning after an earthquake measuring 5.3 on the Ritcher scale jolted Nepal and bordering ...is a measure of the amount of energy released during an earthquake 3. The location where the earthquake starts below the earth's surface is called the ..... and the location directly above it on the earth's surface is called the 4. ..... are the most frequent type of natural disaster and occur when an overflow of water submerges land that is ...If 2 earthquakes measure 4 and 6 on the richter scale,it does not mean that second earthquake is 1.5 times first earthquake It actually means that it is 1000 times the first earthquake Seismograph It is an equipment used to measure seismic waves of an earthquake It has a vibrating rod or pendulum which is attached to a penIn an earthquake, damage to buildings and infrastructure is related more closely to ground motion, of which PGA is a measure, rather than the magnitude of the earthquake itself. For moderate earthquakes, PGA is a reasonably good determinant of damage; in severe earthquakes, damage is more often correlated with peak ground velocity.Earthquake intensity is most often measured using the modified Mercalli scale, which was invented by the Italian geologist Giuseppi Mercalli in 1902 and uses Roman numerals from I to XII. In the United States, we use the modified Mercalli scale, which was adjusted to account for differences in buildings between Italy and southern California.Mercalli Intensity Scale. Earthquakes are described in terms of what nearby residents felt and the damage that was done to nearby structures. Richter magnitude scale. Developed in 1935 by Charles Richter, this scale uses a seismometer to measure the magnitude of the largest jolt of energy released by an earthquake. Moment magnitude scale.Jul 30, 2023 ... Richter Scale & Earthquake Magnitude: How It's Measured (Formula) · Earthquakes can cause serious damage depending on their magnitude.Earthquake detection. A seismogram is a record of the ground motions caused by seismic waves from an earthquake. A seismograph or seismometer is the measuring instrument that creates the seismogram. Almost all seismometers are based on the principle of inertia, that is, where a suspended mass tends to remain still when the ground moves.Mercalli Intensity Scale. Earthquakes are described in terms of what nearby residents felt and the damage that was done to nearby structures. Richter magnitude scale. Developed in 1935 by Charles Richter, this scale uses a seismometer to measure the magnitude of the largest jolt of energy released by an earthquake. Moment magnitude scale. The magnitude ("size") of an earthquake is based on the measurement of the maximum motion recorded by a seismograph. Several scales of measurement have been developed. The most familiar of these is the Richter scale - related to the size of seismic waves produced during a quake. However, today seismologists more commonly rely on what is ...Seismic Hazard Measurement of Earthquake Swarms Activity Based on Horizontal Vertical to Spectral Ratio Analysis (HVSR) in West Halmahera, Indonesia. ... Analysis obtained from the results of the data shows that the topographic influence is also very significant with the earthquake waves that occur. Export citation and abstract …That 0.5 difference is much more meaningful than you'd think. Another large earthquake struck Nepal today. It was estimated as a magnitude 7.3 by the United States Geological Survey. Due to the logarithmic way earthquakes are measured, this...3m ago. Major League Soccer introduced a temporary measure last week prohibiting fans attending matches from bringing signs, banners, flags or Tifos that reference the ongoing conflict in the ...Measuring the size of an earthquake. January 1, 1989. Earthquakes range broadly in size. A rock-burst in an Idaho silver mine may involve the fracture of 1 meter of rock; the 1965 Rat Island earthquake in the Aleutian arc involved a 650-kilometer length of the Earth's crust. Earthquakes can be even smaller and even larger. Magnitude is the most common measure of earthquake size, as it determines the size of the earthquake at the focus and is the same number no matter where you are or what the shaking may feel like. Though outdated and no longer used, the Richter scale is the most well-known magnitude scale devised for an earthquake and was the first one developed ... Measuring earthquakes. Seismometers are the instruments that are used to measure the motion of the ground, which includes those seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources. A Seismograph is also another term used to mean seismometer though it is more applicable to older instruments.Oct 2, 2019 ... Today seismic events may be measured based on body waves or surface waves (these are explained in Earthquakes in a Nutshell). The formulas ...An earthquake's seismic moment can be estimated in various ways, which are the bases of the M wb, M wr, M wc, M ww, M wp, M i, and M wpd scales, all subtypes of the generic M w scale. See Moment magnitude scale § Subtypes for details. Seismic moment is considered the most objective measure of an earthquake's "size" in regard of total energy.A better measure of the size of an earthquake is the amount of energy released by the earthquake, which is related to the Richter Scale by the following equation: Log E = 11.8 + 1.5 M (where Log refers to the logarithm to the base 10, E is the energy released in ergs and M the Richter magnitude).There are countless ways of minimizing the impact of earthquakes, such as securing furniture and building structures that meet current standards for earthquake-prone areas. During an earthquake, people should not move around or try to get o...May 8, 2020 ... Seismic waves are measured on a seismograph. Seismographs contain a lot of information, and not just about earthquakes. Seismometers. A ...The size or magnitude of earthquakes is determined by measuring the amplitude of the seismic waves recorded on a seismograph and the distance of the seismograph from the earthquake. For every unit increase in magnitude, there is roughly a thirty-fold increase in the energy released.For example, the magnitude 6.9 1994 Northridge earthquake, which resulted in severe damage in the Los Angeles, area, was caused by between two and four meters of slip on a fault measuring about 12 ...Jul 27, 2021 · An earthquake’s most intense shaking is often felt near the epicenter. However, the vibrations from an earthquake can still be felt and detected hundreds, or even thousands of miles away from the epicenter. How Do We Measure Earthquakes? The energy from an earthquake travels through Earth in vibrations called seismic waves. Scientists can ... 11.3 Measuring Earthquakes. There are two main ways to measure earthquakes. The first of these is an estimate of the energy released, and the value is referred to as. magnitude. . This is the number that is typically used by the press when a big earthquake happens. It is often referred to as “Richter magnitude,” but that is a misnomer, and ...Measuring an Earthquake’s Impact There are three factors to assess the impact of Earthquakes – magnitude, energy, and intensity. Magnitude is a number most commonly associated with the Richter scale, describing the size of an Earthquake on a scale from 0 to 10 – the latter of which is the maximum motion recorded by a seismograph.News Hour @ 2pm. #newshour #tvlicence #gbc88People feel approximately 1 million earthquakes a year, usually when they are close to the source and the earthquake registers at least moment magnitude 2.5. Major earthquakes of moment magnitude 7.0 and higher are extremely rare. The U. S. Geological Survey (USGS) Earthquakes Hazards Program real-time map shows the location and magnitude of ...Earthquake - Seismic Waves, Properties, Geology: At all distances from the focus, mechanical properties of the rocks, such as incompressibility, rigidity, and density, play a role in the speed with which the waves travel and the shape and duration of the wave trains. The layering of the rocks and the physical properties of surface soil also affect wave characteristics. In most cases, elastic ...Monitoring Earthquakes. We monitor earthquakes by measuring the seismic waves they generate. Seismic waves are generated when the two sides of a fault ...The U.S. Geological Survey provided measurements of a 5.2 magnitude with an epicenter near Bharatpur. Three tremors of 4.3, 4.1 and 3.8 magnitude also hit the region later Sunday, according to India’s Center for Seismology. Earthquakes are common in Nepal. A 7.8 magnitude earthquake in 2015 killed some 9,000 people.Earthquakes in Utah. Utah has experienced 17 earthquakes greater than magnitude (M) 5.5 since pioneer settlement in 1847, and geologic investigations of our region’s faults indicate a long history of repeated large earthquakes of M6.5 and greater prior to settlement. Explore this site to find data and maps of Utah’s recent earthquakes ...Seismic intensity scales categorize the intensity or severity of ground shaking (quaking) at a given location, such as resulting from an earthquake.They are distinguished from seismic magnitude scales, which measure the magnitude or overall strength of an earthquake, which may, or perhaps may not, cause perceptible shaking.. Intensity scales are based on the observed effects of the shaking ...Scientists no longer rely on the the Richter scale to measure an earthquake's power. Here's how earthquakes are measured, and why a 7.1 quake is worse than you might imagine.There are two ways by which we can measure the strength of an earthquake: magnitude and intensity. Magnitude is proportional to the energy released by an earthquake at the focus. It is calculated from earthquakes recorded by an instrument called seismograph. It is represented by Arabic Numbers (e.g. 4.8, 9.0).To measure earthquakes that happened before 1900, scientists review historical accounts of damage to buildings, the distance at which people felt tremors, and reports on changes in the soil. Each ...Measuring earthquakes is no easy task, given they strike suddenly and sometimes at global scale. When the Earth’s crust shifts abruptly, an earthquake occurs, with energy radiated out as seismic ...M = 32 log(S0S). One earthquake has magnitude 3.9 on the MMS scale. If a second earthquake has 750 times as much energy as the first, find the magnitude of the second quake. Round to the nearest hundredth. algebra2. use the Richter scale. R = log I/I0 R= logI /I 0. for measuring the magnitude R of an earthquake.Shallow earthquakes are between 0 and 70 km deep; intermediate earthquakes, 70 - 300 km deep; and deep earthquakes, 300 - 700 km deep. In general, the term "deep-focus earthquakes" is applied to earthquakes deeper than 70 km. All earthquakes deeper than 70 km are localized within great slabs of lithosphere that are sinking into the Earth's mantle.1. learn about the cause of earthquakes, 2. learn about how scientists measure earthquake intensity, 3. build their own seismograph to measure shaking. Materials . marker or felt-tip pen . plastic or metal ruler that is flexible . tape (masking tape is best) something heavy (a can of soup is perfect!) newspaper or other big scratch paper ...People feel approximately 1 million earthquakes a year, usually when they are close to the source and the earthquake registers at least moment magnitude 2.5. Major earthquakes of moment magnitude 7.0 and higher are extremely rare. The U. S. Geological Survey (USGS) Earthquakes Hazards Program real-time map shows the location and magnitude of ... An earthquake measuring 6.1 on the Richter scale and with its epicentre at Khari had jolted Dhading and surrounding districts this morning. Related News. Maha Navami being observed today. Six dead as jeep plunges into river in Palpa. Bodies of four Nepalis killed in Israel brought to Kathmandu.
Measuring earthquakes. Scientists use two values to describe the size of an earthquake – magnitude and intensity. Magnitude. The magnitude of an earthquake is a measure of the total amount of energy released by the ground movement at its source. It is commonly determined by analysing the shaking recorded on several seismographs.. Corn soup recipe native american
The correct answer is Mercalli scale. Key Points The intensity of an earthquake is measured by the Mercalli Scale. It is named after Mercall.Earthquakes in Utah. Utah has experienced 17 earthquakes greater than magnitude (M) 5.5 since pioneer settlement in 1847, and geologic investigations of our region’s faults indicate a long history of repeated large earthquakes of M6.5 and greater prior to settlement. Explore this site to find data and maps of Utah’s recent earthquakes ...An earthquake measuring 5.3 on the Richter scale hit Nepal's Kathmandu on Sunday. Dramatic visuals during the tremors has went viral on the internet. ... a devastating 7.8 magnitude earthquake and ...How are earthquakes measured? · The magnitude scale is known as the Richter scale. The magnitude relates to the energy released during the quake. · The intensity ...Mercalli Intensity Scale. Earthquakes are described in terms of what nearby residents felt and the damage that was done to nearby structures. Richter magnitude scale. Developed in 1935 by Charles Richter, this scale uses a seismometer to measure the magnitude of the largest jolt of energy released by an earthquake. Moment magnitude scale.San Francisco earthquake of 1989, major earthquake that struck the San Francisco Bay Area, California, U.S., on October 17, 1989, and caused 63 deaths, nearly 3,800 injuries, and an estimated $6 billion in property damage. It was the strongest earthquake to hit the area since the San Francisco earthquake of 1906.Calculus. Calculus questions and answers. The Richter scale provides a measure of the magnitude of an earthquake. The following formula shows a relationship between the amount of energy released and the Richter number. M=32log0.007E where E is measured in kilowath-hours. a. What value of E gives a Richter number M=7.8 ? (Use scientific notation.Jun 22, 2023 · Sometimes, earthquakes at or below a magnitude of 3.5 will still use the Richter Scale for taking measurements. The Richter Scale is an otherwise outdated measurement system due to its inability to measure very large earthquakes. In addition to measuring an earthquake’s magnitude, we can also measure its intensity. Magnitude describes the overall size of an earthquake as an event in the earth. Magnitude represents the total energy the earthquake radiates, and is calculated using information on how large an area moves, the distance that one side of the fault moves past the other, and the rigidity of the rock.Lucknow: Tremors shook many parts of eastern and central Uttar Pradesh, including Lucknow, early on Sunday morning after an earthquake measuring 5.3 on the …Brussels has been deeply worried about this election, even if little was said in public.An earthquake prediction must define 3 elements: 1) the date and time, 2) the location, and 3) the magnitude. Yes, some people say they can predict earthquakes, but here are the reasons why their statements are false: They are not based on scientific evidence, and earthquakes are part of a scientific process.There are two ways by which we can measure the strength of an earthquake: magnitude and intensity. Magnitude is proportional to the energy released by an earthquake at the focus. It is calculated from earthquakes recorded by an instrument called seismograph. It is represented by Arabic Numbers (e.g. 4.8, 9.0).A network of geological monitoring stations, each with instruments that measure how much the ground shakes over time called seismographs allow scientists to calculate an earthquake's time ...Mercalli Intensity Scale. Earthquakes are described in terms of what nearby residents felt and the damage that was done to nearby structures. Richter magnitude scale. Developed in 1935 by Charles Richter, this scale uses a seismometer to measure the magnitude of the largest jolt of energy released by an earthquake. Moment magnitude scale. When attempting to predict the decrease in moment magnitude (the measure of the total amount of energy released during an earthquake) between the principal earthquake and the largest aftershock, seismologists often refer to Båth’s Law, which notes that the average difference in size between the two events is 1.2 orders of …Seismograph, the Richter Scale and the Mercalli Scale are used for measuring the direction and intensity of earthquakes. definition. Seismograph. The direction ...Question: Task 2: Locating and measuring an Earthquake An earthquake occurred somewhere within the area shown by the map located in eastern Canada. The three seismic stations indicated on the map recorded the data N PV = 6.2kmis te Location of three seismic stations in an earthquake area. A highway (grey line) runs through it.The correct answer to your question is: "All of these options".Explanation. To make a building safer in an earthquake, several measures can be taken. These include: Securing heavy objects: This prevents them from falling and causing injury or damage during an earthquake.. Repairing any structural damage: Existing damage can exacerbate the …Advertisement Let's start with hurricanes, with their low-pressure "eye" and multitudes of thunderstorms spinning around it. You probably know that these large tropical cyclones are releasing a lot of energy. But how much is a lot, really? ...A network of geological monitoring stations, each with instruments that measure how much the ground shakes over time called seismographs allow scientists to calculate an earthquake's time ....
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