Objectives Relate earthquake activity to plate tectonics Define earthquake, and identify the focus and epicenter of an earthquake. Describe the types of waves emitted during an earthquake. Distinguish between earthquake intensity and magnitude. Review some current methods of earthquake prediction. Why do ...
* Focus and Epicenter All earthquakes start beneath Earth’s surface. The focus of an earthquake is the point underground where rocks first begin to move. Seismic waves travel outward from the earthquake’s focus. The epicenter is the point on Earth’s surface directly above the focus. * ...
EARTHQUAKE DEFINITIONS FAULT LINE EPICENTER FOCUS The line on which the earth’s crust moves The point on the earth’s surface where the earthquake occurred. The exact point in the earth’s surface where the earthquake occurred. Epicenter and Focus MORE DEFINITIONS SEISMIC ACTIVITY SEISMOLOGIST SEISM...
Basic Concept and Related Terms of EarthquakeEarthquake Magnitude (震级) Hypocenter (also called focus)(震源)--- it is the position of an earthquake originates. Epicenter (震中)--- it is the point on the earth surface that is directly above the hypocenter.Depth of hypocenter (震源深度)...
An earthquake's focus refers to the origin of the rupture, whereas an epicenter is the point on the Earth's surface that is directly above the focus...Become a member and unlock all Study Answers Try it risk-free for 30 days Try it risk-free Ask a question Our experts can answer ...
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How is an Earthquake’s Epicenter Located? Time-distance graph showing the average travel times for P- and S- waves. The farther away a seismograph is from the focus of an earthquake, the longer the interval between the arrivals of the P- and S- waves Locating the Earthquake How is an ...
Intensity Intensity when focus depth Intensity when distance from epicenter Also depends on what ground is made of – why? Let’s see it! Did You Feel It? http://earthquake.usgs.gov/eqcenter/dyfi.php
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andstrongearthquakes.Inthestudyregioncenterontheepicenterofthe1989Datong- Yanggaoearthquake(M5.9)withinaradiusoflessthan0.8。,withthetimelengthof 3600days,thelongertimelengthof3700days,andthetimestepof100days,the correlationcoefficientfrom1980to2009issteadybetween0.94and1.00。buttherewere anomalieswithvaluesless...