Tectonic Features of a Triple-plate Junction in Hokkaido Using Local Seismic Tomography
- Title
- Tectonic Features of a Triple-plate Junction in Hokkaido Using Local Seismic Tomography
- Author
- 김소구
- Issue Date
- 2005-04
- Publisher
- 대한지질공학회
- Citation
- 2005 대한지질공학회 학술발표논문집, Page. 101-106
- Abstract
- The three-dimensional Tomography developed by Kim and Bae(2004) was applied to
64,024 P and 64,618 S wave arrival times observed at 238 seismic stations for
4050 local earthquakes in the depth range from 0 to 300 km in and around Hokkaido,
Japan. High and low velocity zones for Vp/Vs were clearly imaged in and around
Hokkaido. The upper seismic planes of the double seismic zone (DSZ) were found
in the subducted Pacific Plate beneath Hokkaido at depth of 40- 80 km, which
produced high seismicity around Hokkaido. The findings of high Vp/Vs anomalies
beneath the Moho discontinuity supports an evidence of a surface triple-collision
hypothesis prepared by Moriya(1994) that the Kuril Arc(Okhotsk Plate or North
American Plate) is colliding against the NE Japanese Arc(Amurian Plate or Eurasian
Plate), along and beneath the Hidaka Mountain Range, and at the same time
the Pacific Plate is subducting into these two plates, making an equilibrium of
tectonic forces along the Hikada Mountain Range (HMR) corner and the central
tectonic axis(142~143E) in Hokkaido. The low Vp and Vs were also found in east
and west along the central tectonic axis in which the focal mechanism represents
the extensional forces. These phenomena are also consistent with low Bouguer
gravity anomalies in this region. It is understood why most of great earthquakes
occurred outside Hokkaido where the balance of tectonic forces are breaking from
the triple junction of three tectonic forces in Hokkaido.
- URI
- http://kiss.kstudy.com/thesis/thesis-view.asp?key=2934783https://repository.hanyang.ac.kr/handle/20.500.11754/110354
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > ETC
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML