Term for an earthquake that follows a larger one, originating at or near the same focus
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Epicenter - Wikipedia  The epicenter, epicentre /psntr/ or epicentrum is the point on the Earth's surface that is directly above the hypocenter or focus, the point where an earthquake or underground explosion originates. The word derives from the New Latin noun epicentrum, the latinisation of the ... However, in larger events, the length of the fault rupture is much longer, and...
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Earthquakes and Plates | Common questions answered.  The point of which the wave originates is what we call the Earthquake focus (foci plural). ... The epicenter was located at 37.04 N. latitude, 121.88 W. longitude near ... He was one of the many scientist who believed in the idea of one large...
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What is an Earthquake Focus and Epicenter? - Kids Fun Science  The earthquake focus and epicenter are two different places that occur during an ... Earthquake waves do not originate at the epicenter. ... These earthquakes occur in island arc or deep ocean trenches where one plate is ... Love Waves Find out more about Love waves that can topple tall buildings during large earthquakes!
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Plate Tectonic Dictionary  Aa - Aa (pronounced "ah-ah" - a Hawaiian term), is lava that has a rough, jagged, ... Aftershock - An earthquake which follows a larger earthquake or main shock and originates in or near the rupture zone of the larger earthquake. ... Focus - That point within the Earth from which originates the first motion of an earthquake and...
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The violent Earth  The term geologic or natural hazard implies that some force of nature is threatening ... These zones are places where one tectonic plate is being overridden by ... And similar storms around the world, such as typhoons, can cause the same .... follows a larger earthquake or main shock and originates at or near the focus of the...
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Seismograph - World Book Online  The most sensitive seismographs magnify ground motion by as much as 10 ... A nanometer equals one-billionth of a meter, or about 1/25,4000,000 inch. ... Different types of seismographs are used to measure short and long seismic waves. ... The strong motion accelerograph records shaking that is too strong for sensitive...
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What is an Earthquake Focus and Epicenter? - Kids Fun Science  The focus of an earthquake is the point where the rocks start to fracture. It is the ... Directly above the focus on the Earth's surface is the earthquake epicenter.
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Seismographs - Keeping Track of Earthquakes  Apr 7, 2016 ... But sensitive detectors (seismometers) can record theses waves emitted ... that produces a permanent recording, they are called seismographs.
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Plate Tectonics - Crystalinks  Divergent boundaries occur where two plates slide apart from each other. ... This can erupt to the surface, forming long chains of volcanoes inland from the ... of two supercontinents (the other being Laurasia) which were part of the Pangaea ..... that for the first time allow for the simultaneous modeling of Earth's mantle flow,...
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Strike-Slip Fault: Definition & Example | Study.com  A crack that runs through rock and soil and anything else that gets in the way. ... There are two different types of strike-slip fault, which are really only different based ... Earthquakes occur because the crust of the earth moves along its fractures, or faults. ... The transform faults zig-zag between these spreading points, relieving...
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Tsunami - Wikipedia  A tsunami also known as a seismic sea wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions (including .... At the point where its shock has been the most violent the sea is driven back,...
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alaska's good friday earthquake march 27,1964 - USGS ...  Map of Alaska showing the area of the March 27 earthquake and its aftershocks ... epicenters of previous large earthquakes; major faults; volcanoes; and the ... great earthquake with a Richter n:a_gnitude of 8.4 to ... been much higher, and had it struck a more populous ... small cities of Valdez and Cordova, 40 and 70 miles.
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Earthquakes Flashcards | Quizlet  The point on earths surface that is directly above the focus, the point where an ... Focus, or hypocenter: The point at which the slippage occurs. ... -Ground shaking and rupture are effects of an earthquake but these effects are often ... A smaller earthquake near the epicenter of the main event ... -7.9; September 1, 1923
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Teacher Guide - Math/Science Nucleus  different types of energy that are released through seismic waves are ... Heating up a beaker of water causes ... Earth's crust. ... epicenter of an earthquake, the shaking is usually more ... it is next to Point A. Observe your model from the side (its cross-section). You ... However, when you don't understand what cause these.
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Largest Earthquake Recorded - World's Biggest Earthquake  The largest earthquake instrumentally recorded had a magnitude of 9.5 and ... It is referred to as the "Great Chilean Earthquake" and the "1960 Valdivia Earthquake." ... The earthquake occurred beneath the Pacific Ocean off the coast of Chile. ... miles, where the Nazca Plate is subducting beneath the South American Plate.
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Lab 10 - Earthquake Epicenter Location  The point within the earth where the actual movement takes place is called the ... from records made of earthquake waves on devices called seismographs. ... Since P-waves travel faster than S-waves do, the seismograph will detect ... The time difference, as recorded on a clock, between when the P-waves and S-waves...
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Earthquake Facts & Earthquake Fantasy  Large and small earthquakes can also occur on faults not previously recognized; ... A magnitude 12 earthquake would require a fault larger than the earth itself. ... FICTION: The 1906 San Francisco earthquake was the deadliest ever. .... Most of these earthquakes are in the magnitude 3?4 range, large enough to have been...
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1755 Lisbon earthquake - Wikipedia  The 1755 Lisbon earthquake, also known as the Great Lisbon earthquake, occurred in the ... Lisbon was not the only Portuguese city affected by the catastrophe. ... The shock waves of the earthquake destroyed part of Covilh's castle walls and its large .... The second and third plans proposed widening certain streets.
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The Myth of Solid Ground - Ditrianum Media Center  Feb 11, 2016 ... At the heart of any mythology of earthquakes lies the issue of prediction, ... as the Pacific and North American plates continue to creep past each other at .... that it's useful for the USGS to keep records, if only to mollify the predictors, ... "like a vibe or a vibration," and not really useful, while the seismologists,...
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Earthquake Facts & Earthquake Fantasy  ... by constant "creep" resulting in many tiny shocks and a few moderate earth tremors. ... Large and small earthquakes can also occur on faults not previously ... The largest earthquake ever recorded by seismic instruments anywhere on the earth .... About 5% to 10% of earthquakes in California are followed by a larger one...
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U.S.G.S. Pasadena - U.S. Geological Survey  When many of these instruments recorded the M7.2 Landers earthquake of 6/28/92, ... the widely held view was that these events occur only following large (M>7) ...... A Whole Lot of Shaking Going On, Los Angeles Times Op-ed, Lucy Jones ...... Seismology Section of the Western Earthquake Hazards Team, Pasadena, CA.