Reexamination of the interplate coupling in the Tokai region, central Japan, based on the GPS data in 1997–2002

Reexamination of the interplate coupling in the Tokai region, central Japan, based on the GPS data in 1997–2002
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基于1997-2002年GPS数据对日本中部东海地区板间耦合的再考察

DOI:
10.1029/2004gl021404
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发表时间:
2004
影响因子:
5.2
通讯作者:
T. Sagiya
T. Sagiya
中科院分区:
地球科学1区
文献类型:
--
作者:
Y. Ohta;F. Kimata;T. Sagiya

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我们利用三维GPS时间序列和精细的板块边界模型,重新研究了东海地区南开-骏河海槽的板块间耦合的逆滑速率。我们重新分析了GPS数据,重建了板块边界结构。在此基础上反演了1997年4月至2000年4月期间的GPS速度。结果表明,在137.42E, 34.32N附近的15 ~ 25 km深度处,最大回滑速率为2 cm/yr。我们还估计了2001年1月至2002年12月期间的板块间耦合。这一时期与Ozawa等人[2002]发现的慢滑事件相吻合。在哈马纳湖西部地区推断出了高达3厘米/年的前滑。并且,我们发现低频地震的震中位于那里,这表明慢滑事件(SSE)的发生与低频地震之间有着密切的联系。
We re‐examined the interplate coupling in terms of backslip rate at the Nankai‐Suruga trough beneath the Tokai region with a 3‐dimensional GPS time series and a refined plate boundary model. We reanalyzed the GPS data and reconstructed plate boundary configuration. Then we inverted GPS velocities to infer the interplate coupling during April 1997 to April 2000. Our results show that a maximum back slip rate of 2 cm/yr was found at the depth of 15–25 km around 137.42E, 34.32N. We also estimated interplate coupling for the period from January 2001 to December 2002. This time period coincides with a slow slip event found by Ozawa et al. [2002] . Forward slip up to 3 cm/yr was inferred beneath western region of Lake Hamana. And, we found that the epicenters of low frequency tremors are located there, suggestive of a close connection between the occurrences of the slow slip event (SSE) and low frequency tremors.
Sawada Y.:“从空中观察肯尼亚裂谷中的第四纪火山和断层。”
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DOI: 10.1126/science.1070378
发表时间: 2002-05-31
期刊: SCIENCE
影响因子: 56.9
作者:
Obara, K
通讯作者: Obara, K