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1998 Ryukyu Islands earthquake
The occurred on May 4, 1998 at 08:30 local time (UTC+9) (on May 3 at 23:30 UTC) in the Philippine Sea region with Mw 7.5 (USGS) and M7.7 (JMA). The epicenter was from Ishigaki Island, Japan, from Basco, Philippines, and from Hualian, Taiwan. A small local tsunami of was observed on Miyako. The earthquake was felt in the Ryukyu Islands and in parts of eastern Taiwan. The highest intensity was shindo 3 recorded on Yonaguni, Ishigaki, and Miyako. In 1999, the former Japan Marine Science and Technology Center (海洋科学技術センター) (Japan Agency for Marine-Earth Science and Technology (JAMSTEC) (海洋研究開発機構) after 2004) conducted an investigation in the region of the source of this earthquake.
The source of this earthquake was a sinistral (left-lateral) strike-slip fault. It was an intra-plate earthquake inside the Philippine Sea Plate.〔 Such large intra-plate earthquakes inside the Philippine Sea Plate are not very common in this region. This earthquake was the strongest intra-plate earthquake inside the Philippine Sea Plate in the Ryukyu Islands region in 100 years as it occurred.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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