Statistical analysis of seismicity in a wide region around the 1998 Mw 8.1 Balleny Islands earthquake in the Antarctic Plate
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概要
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A large earthquake (Mw 8.1) that occurred off the North Coast of the Antarctic continent near the Balleny Islands on 25 March 1998 was the largest intra-plate earthquake ever recorded in the Antarctic Plate. The earthquake hypocenter catalog for this area shows a marked change in seismicity following the main shock in a large area around the Balleny aftershock region. However, the earthquake catalog includes many aftershocks and is affected by a variable detection rate. To overcome these limitations, we applied statistical models and methods, including Gutenberg–Richter's magnitude frequency distribution, the Epidemic-Type Aftershock Sequences (ETAS) model, and the space–time ETAS model, thereby enabling calculation of the change in detection rate. The results show a change in the spatial pattern of background seismicity over a large region after the 1998 event.
著者
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Kanao Masaki
Department Of Earth Science National Institute Of Polar Research
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Ogata Yosihiko
The Institute Of Statistical Mathematics
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Kanao Masaki
Department Of Earth Science National Institute Of Polar Research 10-3 Midoricho Tachikawa Tokyo 190-
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Himeno Tetsuto
Transdisciplinary Research Integration Center, Research Organization of Information and Systems, Kam
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Himeno Tetsuto
Transdisciplinary Research Integration Center Research Organization Of Information And Systems Kamiy
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Ogata Yosihiko
The Institute Of Statistical Mathematics 10-3 Midoricho Tachikawa Tokyo 190-8562 Japan.
関連論文
- Spacial distribution and time variation in seismicity around the Antarctic Plate-Indian Ocean region
- Significant improvements of the space-time ETAS model for forecasting of accurate baseline seismicity
- Statistical analysis of seismicity in a wide region around the 1998 Mw 8.1 Balleny Islands earthquake in the Antarctic Plate