Precise hypocenter locations of midcrustal low-frequency earthquakes beneath Mt. Fuji, Japan

Haruhisa Nakamichi; Motoo Ukawa; Shinichi Sakai

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Precise hypocenter locations of midcrustal low-frequency earthquakes beneath Mt. Fuji, Japan

机译：山下的中地低频地震的精确震中位置。日本富士

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Midcrustal low-frequency earthquakes (MLFs) have been observed at seismic stations around Mt. Fuji, Japan. In September-December 2000 and April-May 2001, abnormally high numbers of MLFs occurred. We located hypocenters for the 80 MLFs during 1998-2003 by using the hypoDD earthquake location program (Waldhauser and Ellsworth, 2000). The MLF hypocenters define an ellipsoidal volume some 5 km in diameter ranging from 11 to 16 km in focal depth. This volume is centered 3 km northeast of the summit and its long axis is directed NW-SE. The direction of the axis coincides with the major axis of tectonic compression around Mt. Fuji. The center of the MLF epicenters gradually migrated upward and 2-3 km from southeast to northwest during 1998-2001. We interpret that the hypocentral migration of MLFs reflects magma movement associated with a NW-SE oriented dike beneath Mt. Fuji.

机译：在山附近的地震台站观测到中地壳低频地震（MLF）。日本富士。在2000年9月至12月和2001年4月至5月，发生了异常大量的MLF。通过使用hypoDD地震定位程序，我们在1998-2003年期间确定了80个多边基金的震中（Waldhauser和Ellsworth，2000）。 MLF震源定义了一个椭圆形体积，直径约5 km，焦深范围为11至16 km。该体积的中心位于山顶东北3公里处，其长轴指向NW-SE。轴的方向与围绕Mt的构造压缩的主轴一致。富士在1998-2001年期间，MLF震中中心逐渐从东南向西北向上迁移并迁移了2-3公里。我们解释说，MLF的偏心迁移反映了与Mt下方NW-SE定向堤防有关的岩浆运动。富士

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《Earth, planets and space: EPS》 |2004年第11期|共1页
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Haruhisa Nakamichi; Motoo Ukawa; Shinichi Sakai;
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Precise hypocenter locations of midcrustal low-frequency earthquakes beneath Mt. Fuji, Japan

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