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Date : 2006-05-29
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Deep Earthquakes Why They Happen ~ Thus there are plenty of candidates for the energy behind deep earthquakes at all depths between 70 and 700 km perhaps too many The roles of temperature and water are important at all depths as well though not precisely known As scientists say the problem is still poorly constrained
Deep Earthquakes Pacific Northwest Seismic Network ~ Deep Earthquakes The most common source of damaging earthquakes in Washington and Oregon are deep earthquakes that rupture faults within the subducting Juan de Fuca plate intraplate earthquakes These occur beneath Puget Sound at depths from 30 km to 70 km
Deepfocus earthquake Wikipedia ~ The deepest sections of the Philippines Sea Plate cause earthquakes as deep as 675 kilometres 419 mi below the surface Notable deepfocus earthquakes in this region include a M w 77 earthquake in 1972 and the M w 76 75 and 73 2010 Mindanao earthquakes Indonesia
New understanding of deep earthquakes Geology Page ~ Researchers have known for decades that deep earthquakes — those deeper than 60 kilometers or about 37 miles below the Earth’s surface — radiate seismic energy differently than those that originate closer to the surface But a systematic approach to understanding why has been lacking
Earthquake Shallow intermediate and deep foci Britannica ~ Of the total energy released in earthquakes 12 percent comes from intermediate earthquakes—that is quakes with a focal depth ranging from about 60 to 300 km About 3 percent of total energy comes from deeper earthquakes The frequency of occurrence falls off rapidly with increasing focal depth in the intermediate range
The mystery of deep earthquakes Berkeley Science Review ~ The term “deep earthquake” is used loosely to refer to intermediatefocus and deepfocus earthquakes Going by this classification approximately one in four measurable earthquakes can be classified as a deep earthquake
At what depth do earthquakes occur What is the ~ Earthquakes occur in the crust or upper mantle which ranges from the earths surface to about 800 kilometers deep about 500 miles
Earths Biggest Deep Earthquake Still a Mystery Live Science ~ By analyzing global seismological data researchers determined that the quake was the biggest deep earthquake ever recorded A prior deep earthquake in Bolivia in 1994 was the same magnitude
Difference between Shallow Focus and Deep Focus Earthquakes ~ Deep focus earthquakes are known as intraplate earthquakes as they are triggered off by collision between plates Shallowfocus earthquakes occur at depths less than 70 km while deepfocus earthquakes occur at greater focal depths of 300 – 700 km
What does it mean that the earthquake occurred at a depth ~ An earthquake cannot physically occur at a depth of 0 km or 1km above the surface of the earth In order for an earthquake to occur two blocks of crust must slip past one another and it is impossible for this to happen at or above the surface of the earth
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