Precise hypocenter locations of midcrustal low-frequency earthquakes beneath Mt. Fuji, Japan
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Abstract
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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Precise hypocenter locations of midcrustal low-frequency earthquakes beneath Mt. Fuji, Japan |
| Series title | Earth, Planets and Space |
| DOI | 10.1186/BF03352542 |
| Volume | 56 |
| Issue | 12 |
| Year Published | 2004 |
| Language | English |
| Publisher | Springer |
| Description | 4 p. |
| First page | e37 |
| Last page | e40 |
| Country | Japan |
| Other Geospatial | Mt. Fuji |
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