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Exercise II - Earthquakes, volcanoes and tectonics
Exercise II - Earthquakes, volcanoes and tectonics

... A) On the attached table, record the date, location (in latitude and longitude), magnitude, and depth of 10 recent (past week) earthquakes from various locations around the globe (3pts); B) Plot and label the locations of these earthquakes on the plate boundary map (3pts); C) Determine the plate tec ...
Nature`s Fury Educator`s Guide - American Museum of Natural History
Nature`s Fury Educator`s Guide - American Museum of Natural History

... of predicting and preparing for them. ...
Fact Sheet - SharpSchool
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... destruction, as a result of movements within the earth's crust or volcanic action. At the Earth's surface, earthquakes show themselves by shaking and sometimes causing dislocation of the ground. When the epicenter of a large earthquake is located offshore, the seabed may be dislocated sufficiently t ...
build an earthquake-resistant structure
build an earthquake-resistant structure

... Epicenter: The spot on the Earth’s surface that is directly over the place where an earthquake begins. Seismic waves: Energy released in the form of waves after tectonic plates have shifted. Tectonic plates: The plates that make up the outermost layer of the Earth’s crust, also called the lithospher ...
build an earthquake-resistant structure
build an earthquake-resistant structure

... Epicenter: The spot on the Earth’s surface that is directly over the place where an earthquake begins. Seismic waves: Energy released in the form of waves after tectonic plates have shifted. Tectonic plates: The plates that make up the outermost layer of the Earth’s crust, also called the lithospher ...
Living Physical Geography Instructor`s Manual CHAPTER 14
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... lahars and pyroclastic flows are very dangerous to people. The greatest concentration of dangerous stratovolcanoes occurs in the Pacific Ring of Fire. Earthquakes are also a significant hazard to people. Earthquakes occur as the crust breaks along a fault and releases seismic waves that travel throu ...
Hazardous Earth - The Student Room
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...  The earth’s crust is divided into a series of plates. These plates are either oceanic (thin and dense) or continental (thick).  Radioactive reactions occur inside the core which produces convection currents in the mantle. This causes the tectonic plates to move.  At mid-ocean ridges, there is a ...
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... strike-slip faults in the San Francisco Bay Region. Jon developed and maintained the project from 1979-2001 (e.g., Galehouse, 2002) and the project has been funded since its beginning by the U.S. Geological Survey, National Earthquakes Hazards Reduction Program. In 2001, Karen Grove and I took the r ...
PowerPoint Presentation - Slide 1
PowerPoint Presentation - Slide 1

... Fire, a zone of frequent earthquakes and volcanic eruptions. The trenches are shown in bluegreen. The volcanic island arcs, although not labelled, are parallel to, and always landward of, the trenches. For example, the island arc associated with the Aleutian Trench is represented by the ...
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Inside Earth: Chapter 1
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... Describe what occurs when the friction along a fault line is high. • Both sides of the fault lock together and do not move • The stress increases until it is strong enough to overcome the force of friction • Larger and/or more frequent earthquakes will occur ...
Earthquakes: Basic Principles
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... alarming and destructive natural phenomena that people can experience. It is also known and well documented that these events are distressing to animals as well, although no one knows as yet what the animals’ sense just before the occurrence of an earthquake. The occurrence of large earthquakes is o ...
Chapter 18 Earthquakes and Volcanoes
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... layer of soil, and rock called the crust. Each of the first three layers are essentially continuous pieces; the crust however is broken up into large chunks called tectonic plates. The convection currents exert huge forces on the plates causing them to occasionally move very slightly. When this happ ...
Seismic Observation Equipment
Seismic Observation Equipment

... Typical acceleration seismometer used in Japan for strong motion observation. It was named after the acronym of the Strong Motion AcSMAC type strong-motion seismometer celerometer Committee. A scale to quantitatively indicate the size (magnitude) of an earthquake but there are multiple definitions u ...
Quaking, Shaking, Earth - East Hanover Township School District
Quaking, Shaking, Earth - East Hanover Township School District

... squeeze rock. • If rock breaks from forces pushing from opposite directions, rock above a reverse fault surface is forced up and over the rock below the fault surface. • Cascadia ...
Seismographs - Keeping Track of Earthquakes
Seismographs - Keeping Track of Earthquakes

... three separate instruments to record horizontal waves - (1) one to record the north-south waves, (2) another to record east-west waves, and (3) a vertical one in which a weight resting on a spring tends to stand still and record vertical ground motions. The spring-suspended mass lags behind the moti ...
Unit 3: Earthquake Waves Introduction
Unit 3: Earthquake Waves Introduction

... greater velocity (speed) than S waves. However, the velocities of seismic waves depend upon the physical properties of the material through which the waves travel (medium). Higher density media result in a higher velocity of wave propagation. ...
earthquake risk due to hotspot volcanoes: the case of hawaii
earthquake risk due to hotspot volcanoes: the case of hawaii

... minor to be felt but some are strong enough to cause minor to ...
Geologic Framework of Western Oregon and Washington
Geologic Framework of Western Oregon and Washington

... Oregon is separated by many different regions like the Blue and Klamath mountains, the Willamette valley, the Coast Range, and the Western and High Cascades. Each of these regions are characterized and uniquely defined by their own seismic history, and more importantly their seismic potential. A maj ...
Earthquakes: Basic Principles
Earthquakes: Basic Principles

... alarming and destructive natural phenomena that people can experience. It is also known and well documented that these events are distressing to animals as well, although no one knows as yet what the animals’ sense just before the occurrence of an earthquake. The occurrence of large earthquakes is o ...
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Earthquake



An earthquake (also known as a quake, tremor or temblor) is the perceptible shaking of the surface of the Earth, which can be violent enough to destroy major buildings and kill thousands of people. The severity of the shaking can range from barely felt to violent enough to toss people around. Earthquakes have destroyed whole cities. They result from the sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.Earthquakes are measured using observations from seismometers. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe. The more numerous earthquakes smaller than magnitude 5 reported by national seismological observatories are measured mostly on the local magnitude scale, also referred to as the Richter magnitude scale. These two scales are numerically similar over their range of validity. Magnitude 3 or lower earthquakes are mostly almost imperceptible or weak and magnitude 7 and over potentially cause serious damage over larger areas, depending on their depth. The largest earthquakes in historic times have been of magnitude slightly over 9, although there is no limit to the possible magnitude. The most recent large earthquake of magnitude 9.0 or larger was a 9.0 magnitude earthquake in Japan in 2011 (as of March 2014), and it was the largest Japanese earthquake since records began. Intensity of shaking is measured on the modified Mercalli scale. The shallower an earthquake, the more damage to structures it causes, all else being equal.At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity.In its most general sense, the word earthquake is used to describe any seismic event — whether natural or caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake's point of initial rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter.
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