Characteristics of ring seismicity in different depth ranges before large and great earthquakes in the Sumatra region |
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| Authors: | Kopnichev Yu F Sokolova I N |
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| Institution: | (1) Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita13 Nishi7 Kita-Ku, Sapporo, 060-8586, Japan |
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| Abstract: | Characteristics of the seismicity in depth ranges 0–33 and 34–70 km before ten large and great (M
w
= 7.0−9.0) earthquakes of 2000–2008 in the Sumatra region are studied, as are those in the seismic gap zones where no large
earthquakes have occurred since at least 1935. Ring seismicity structures are revealed in both depth ranges. It is shown that
the epicenters of the main seismic events lie, as a rule, close to regions of overlap or in close proximity to “shallow” and
“deep” rings. Correlation dependences of ring sizes and threshold earthquakes magnitudes on energy of the main seismic event
in the ring seismicity regions are obtained. Identification of ring structures in the seismic gap zones (in the regions of
Central and South Sumatra) suggests active processes of large earthquake preparation proceed in the region. The probable magnitudes
of imminent seismic events are estimated from the data on the seismicity ring sizes. |
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