地震 第2輯
Online ISSN : 1883-9029
Print ISSN : 0037-1114
非地震性すべりの時空間変化と大地震の発生予測
―三陸沖における近年の進展を中心に―
飯尾 能久松澤 暢吉田 真吾加藤 照之平田 直
著者情報
ジャーナル フリー

2003 年 56 巻 2 号 p. 213-229

詳細
抄録

We review recent studies on spatial distribution of asperities, and space-time variations of aseismic slips deduced from analyses of strong ground motions, displacement rates, continuous crustal deformations, and repeated microearthquakes in the Sanriku-oki region along the Japan trench. These various analyses suggest a possible scenario about occurrence of large earthquakes; asperities, which are defined as areas of large slips at earthquakes, repeatedly break when the stresses at asperities are loaded and reach to their strengths by aseismic slips occurring in the surrounding regions. If this scenario is the case and we estimate the strength, extent of asperities, and space-time variations of aseismic slips around the asperities, we will be able to forecast occurrence of large earthquakes to some extent. Moreover, we will be able to simulate the whole subduction process including seismic cycles along a subducting plate boundary if we find a conclusive constitutive law of frictional slip and succeed in estimating detailed distribution of the frictional parameters on the plate boundary. Although loading and generation mechanisms of intraplate earthquakes might not be the same as the interplate ones, the slow slips along the fault surface must play an important role for their generation.

著者関連情報
© 社団法人日本地震学会
前の記事
feedback
Top