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No.109 (2020/9)  >

 
Title :沖合地震観測システムによる沖縄近海での緊急地震速報の改善可能性
Title alternative :Improvements to an earthquake early warning system from an observation system offshore of the Ryukyu Islands
Authors :親川, 佳乃子
中村, 衛
Authors alternative :Oyakawa, Kanoko
Nakamura, Mamoru
Issue Date :Sep-2020
Abstract :We verified the changes in the detection times for the arrival of P-waves, the time difference between the arrivals of S- and P-waves, and the accuracy of hypocenter determination when data from offshore seismic stations were added to those of land-based seismic stations in the Ryukyu Islands via numerical simulation. As a result, the detection times of earthquakes in the Ryukyu Trench and Okinawa Trough were shortened by 15 – 23 seconds and 10–16 seconds, respectively. The time from the detection of P-waves to the arrival of S-waves for an earthquake occurring in the Ryukyu Trench increased by 15 –20 seconds. The accuracy of hypocenter determination also increased when the offshore observation points were used in combination with those from onshore. From these results, we concluded that the accuracy of hypocenter determination could be improved by using both onshore and offshore observation points, which should improve the earthquake early warning system of the Ryukyu Islands.
Type Local :紀要論文
ISSN :2434-8503
Publisher :琉球大学理学部
URI :http://hdl.handle.net/20.500.12000/46906
Citation :琉球大学理学部紀要 = BULLETIN OF THE FACULTY OF SCIENCE UNIVERSITY OF THE RYUKYUS no.109 p.9 -19
Appears in Collections:No.109 (2020/9)

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