Statical and dynamical study on faulting mechanism of the 1923 Kanto earthquake.
スポンサーリンク
概要
- 論文の詳細を見る
An inverse method to find optimum fault parameters from geodetic data with random errors is extended so as to be applicable to a case of the data including a systematic error caused by movements of reference points in triangulation. Application of the new inverse method to static displacement data associated with the Kanto earthquake of 1923 yields a dislocation source model which adequately explains both the seismological and the geodetic data.<BR>From the geodetic data, it is found that the fault motion of the Kanto earthquake is a reverse, right-lateral slip of 4.8m with a slip-angle of 140° on a plane which dips 25° towards N24°E, where the slip-angle is measured counterclockwise from a strike on the fault plane. The fault length, width, and the depth to the upper fault margin are determined as 95km, 54km, and 1.5km respectively. The seismic moment and stress drop of this earthquake are estimated to be 8.4×10<SUP>27</SUP> dyne·cm and 45 bars, respectively.<BR>Taking the static fault solution as the basic model, the dynamic process of the fracture is investigated on the basis of the long-period seismograms recorded at Hongo, Tokyo. The result shows that the rupture starts from a relocated hypocenter, 35.41°N, 139.22°E and 13.5km (depth), and extends outwards on the fault plane with a propagating velocity of the rupture front of 2.0km/sec. The rise time of the source time function is assumed to be 5.0sec. The maximum amplitude of acceleration for a frequency range of 0.0-3.3Hz at Tokyo is estimated to be about 280gal for the horizontal component and to be 60gal for the vertical component, by applying an empirical formula to the calculated ground displacements.
- 公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会の論文
公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会 | 論文
- A numerical experiment on nonlinear image reconstruction from first-arrival times for two-dimensional island arc structure.
- Double-planed structure of intermediatedepth seismic zone and thermal stress in the descending plate.
- Volcanic Tremor Accompanying the 1989 Submarine Eruption off the East Coast of Izu Peninsula, Japan.
- Seismicity in Antarctica.
- Application of GPS Differential Positioning for the Development of the Antarctic Penetrator.