ダウンロード数: 206
このアイテムのファイル:
ファイル | 記述 | サイズ | フォーマット | |
---|---|---|---|---|
jpe1952.22.87.pdf | 2.4 MB | Adobe PDF | 見る/開く |
タイトル: | Some considerations on the faulting mechanism of the southeastern Akita earthquake of October 16, 1970 |
著者: | Mikumo, Takeshi |
発行日: | 1974 |
出版者: | Seismological Society of Japan(日本地震学会) / Geodetic Society of Japan(日本測地学会) / Volcanological Society of Japan(日本火山学会) |
誌名: | Journal of Physics of Earth |
巻: | 22 |
号: | 1 |
開始ページ: | 87 |
終了ページ: | 108 |
抄録: | The faulting process of the southeastern Akita earthquake of October 16, 1970 (M=6.2) that took place on inland of the Tohoku region has been investigated from available seismic and geodetic data. A synthetic study on the radiation pattern of P-wave first motions, spatial distribution of aftershocks, dynamic ground motions in the nearfield, vertical tectonic movements along a nearby leveling route, and on teleseismic observations of S waves, suggests two possible faulting mechanisms. One is a thrust faulting of a western block over an eastern block along a westerly dipping fault plane with N-S strike. This mechanism seems consistent with tectonic features of this region, a belt-like distribution of earthquake damages along this trend, and with the location of the epicenter near the presumed extension of a fault caused by the 1896 earthquake. Another possible mechanism is also thrust faulting of a northeastern block over a southwestern block along a northeasterly dipping fault plane. Spatial distribution of aftershocks inclining northeastwards appears to support the second mechanism. Comparisons of the various observations with the corresponding theoretical calculations for a number of fault models slightly favor the first mechanism, but cannot yield a definite conclusion. The fault parameters such as dimensions, seismic moment, average dislocation, rise time, fracture velocity and stress drop are estimated for four probable models. Pre-earthquake data are also examined in relation to the faulting mechanism. |
著作権等: | © The Seismological Society of Japan © The Geodetic Society of Japan © The Volcanological Society of Japan |
URI: | http://hdl.handle.net/2433/193386 |
DOI(出版社版): | 10.4294/jpe1952.22.87 |
出現コレクション: | 三雲 健 |
このリポジトリに保管されているアイテムはすべて著作権により保護されています。