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2011年2月27日2時 飛騨地方の地震
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1.地震について (Earthquake Information)


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   2011/02/27,02:18:59.032 36.1506 137.4503 3.8 4.8
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Table1. Earthquake information. Origin time, Epicentral latitude, longitude, depth, and JMA magnitude from the left.(ref. JMA source mechanism)


Fig.1. Event location.



2.観測点分布 (Station Distribution)


Fig.2. Station Distribution.



3.緊急地震速報発信状況 (Earthquake Early Warning Report)

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   [01] 11/02/27-02:18:58 04 M4.9 36.2N 137.5E 010km (11/02/27-02:19:06)
   [03] 11/02/27-02:18:58 04 M4.9 36.2N 137.5E 010km (11/02/27-02:19:13)
   [04] 11/02/27-02:18:58 03 M4.8 36.1N 137.5E 010km (11/02/27-02:19:18)
   [05] 11/02/27-02:18:58 03 M4.9 36.1N 137.5E 010km (11/02/27-02:19:32)
   [06] 11/02/27-02:18:58 03 M4.9 36.1N 137.5E 010km (11/02/27-02:19:51)
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(左から順に情報番号,震源時,最大予測震度,マグニチュード, 震央緯度,震央経度,震源深さ,電文発表時刻) from CEORKA
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Table2. Earthquake early warning reports. Information ID, Origin time, Maximum Intensity, JMA magnitude, Epicentral latitude, longitude, depth, and time to issue the report from the left.(ref. The Committee of Earthquake Observation and Research in the Kansai Area)

--> 気象庁による緊急地震速報の内容

4.解析結果 (Analytical Result)


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   GIF0042011022702 137.517 36.249 0.143 2.308 12.494 4.8 3.7
   GIF0072011022702 137.486 36.038 0.125 2.538 12.925 4.8 3.6
   GIF0052011022702 137.251 36.154 0.074 3.598 17.902 4.8 3.1
   GIF0032011022702 137.301 36.332 0.055 4.378 24.191 4.8 2.8
   GIF0082011022702 137.260 35.951 0.086 5.238 27.966 4.8 3.2
   NGN0132011022702 137.785 36.183 0.205 5.408 30.350 4.8 4.0
   NGN0182011022702 137.529 35.813 0.126 6.718 38.113 4.8 3.6
   NGN0172011022702 137.826 35.975 0.118 6.928 39.027 4.8 3.5
   NGN0192011022702 137.708 35.856 0.096 7.048 40.076 4.8 3.3
   GIF0022011022702 137.025 36.273 0.113 7.048 40.574 4.8 3.5
   Observed/Estimated Mw(median) 4.8 3.5
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Table3. Analytical results using Tau_c method (Wu and Kanamori, 2005). Station ID, Station longitude, latitude, tauc, P-arrival time, epicentral distance(km) , magnitude, and estimated magnitude from the left.

5.観測記録 (Observed Records)


Fig.3. Peak Ground Acceleration. 1000Galを超えている観測点(GIF007)は地盤の傾き等、ローカルな影響を受けている可能性がある。


Fig.4. JMA seismic intensity.


Fig.5. Population exposure. A circle size shows the population at the town, and a circle color shows the seismic intensity at the town.


Fig.6. Acceleration waveforms. 1000Galを超えている観測点(GIF007)EW成分は地盤の傾き等、ローカルな影響を受けている可能性がある


Fig.7. Velocity waveforms.

Reference
Wu, Y. M. and H. Kanamori (2005). Experiment on an onsite early warning method for the Taiwan early warning system, Bull. Seism. Soc. Am., 95, 347-353.
気象庁の震度情報、防災科学技術研究所のK-NET,KiK-netの波形を利用しました。

緊急地震速報を発表した地震の解析結果
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