Seismicity Patterns, their Statistical Significance and Physical Meaning

Seismicity Patterns, their Statistical Significance and Physical Meaning

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204 Pure app!. geophys. , P. Reasenberg demonstrated that in Cascadia earthquakes are four times more likely to be foreshocks than in California. Many speakers emphasized the regional differences in all earthquake parameters, and it was generally understood that basic models of the earthquake occurrence must be modified for regional application. The idea that the focal mechanisms of foreshocks may differ from that of background activity was advocated by Y. Chen and identified by M. Ohtake as possibly the thus far most neglected property of foreshocks, in efforts to identify them. S. Matsumura proposed that focal mechanism patterns of small earthquakes may differ character istically near locked fault segments into which fault creep is advancing. Considerable discussion was devoted to the status of the seismic gap hypothesis because M. Wyss argued that the occurrence of the M 7. 9, 1986, Andreanof Islands earthquake was a confirmation of Reid's rebound theory of earthquakes and thus of the time predictable version of the gap hypothesis, whereas Y. Kagan believed he could negate this view by presenting a list of nine earthquake pairs with Mg 7. 4, moment centroid separation of less than 100 km, and time difference less than about 60% of the time he estimated it would take plate motions to restore the slip of the first event.In 1961 the manual calculation of the hypocenter was substituted by a computer system. ... travel timetable for the Kurile Islands region in 1978 (ICHIKAWA, 1978) , and EMT equation in 1977 to estimate earthquake magnitudes (KANBAYASHI and ICHIKAWA, 1977; TAKEUCHI, 1983). ... 2e and 3e) the number of earthquakes was reduced from 946 to 491, with depths selected ranging from 0 to 150 km.

Title:Seismicity Patterns, their Statistical Significance and Physical Meaning
Author:Max Wyss, Kunihiko Shimazaki, Akihiko Ito
Publisher:Birkhäuser - 2012-12-06


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