Pre-seismic geomagnetic anomaly and earthquake location

Chieh Hung Chen; Jann Yenq Liu; Pei Ying Lin; Horng Yuan Yen; Katsumi Hattori; Wen Tzong Liang; Yuh Ing Chen; Yih Hsiung Yeh; Xiaoping Zeng

doi:10.1016/j.tecto.2010.04.018

Pre-seismic geomagnetic anomaly and earthquake location

Chieh Hung Chen, Jann Yenq Liu^*, Pei Ying Lin, Horng Yuan Yen, Katsumi Hattori, Wen Tzong Liang, Yuh Ing Chen, Yih Hsiung Yeh, Xiaoping Zeng

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

Many researchers studied the relationships between appearances of geomagnetic anomalies and their distances to earthquake epicenters or faults. Yet, occasionally some magnetometer stations located nearby earthquake epicenters and/or faults do not observe geomagnetic anomalies. In this paper, a new hybrid system which simultaneously takes the hypocenter and fault plane solution into account is constructed to examine 38 earthquakes interpreted to be associated with geomagnetic anomalies during the period 1988-2001 in Taiwan. The Surface Magnetic Anomaly Reference Tip (SMART) of the new system is used instead of the epicenter or the fault to investigate statistically the distance relationship between the anomalies and the earthquake parameters. Results show that the anomalies gather along the fault and in the belt zone to the SMART. Possible mechanisms causing the anomalies in the two zones are proposed and discussed. Characteristics of the anomaly might shed some light on locations of faults before earthquake occurrences.

Original language	English
Pages (from-to)	240-247
Number of pages	8
Journal	Tectonophysics
Volume	489
Issue number	1-4
DOIs	https://doi.org/10.1016/j.tecto.2010.04.018
Publication status	Published - 2010 Jun
Externally published	Yes

Keywords

Earthquake forecast
Focal mechanism
Geomagnetic field

ASJC Scopus subject areas

Geophysics
Earth-Surface Processes

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10.1016/j.tecto.2010.04.018

Cite this

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title = "Pre-seismic geomagnetic anomaly and earthquake location",

abstract = "Many researchers studied the relationships between appearances of geomagnetic anomalies and their distances to earthquake epicenters or faults. Yet, occasionally some magnetometer stations located nearby earthquake epicenters and/or faults do not observe geomagnetic anomalies. In this paper, a new hybrid system which simultaneously takes the hypocenter and fault plane solution into account is constructed to examine 38 earthquakes interpreted to be associated with geomagnetic anomalies during the period 1988-2001 in Taiwan. The Surface Magnetic Anomaly Reference Tip (SMART) of the new system is used instead of the epicenter or the fault to investigate statistically the distance relationship between the anomalies and the earthquake parameters. Results show that the anomalies gather along the fault and in the belt zone to the SMART. Possible mechanisms causing the anomalies in the two zones are proposed and discussed. Characteristics of the anomaly might shed some light on locations of faults before earthquake occurrences.",

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author = "Chen, {Chieh Hung} and Liu, {Jann Yenq} and Lin, {Pei Ying} and Yen, {Horng Yuan} and Katsumi Hattori and Liang, {Wen Tzong} and Chen, {Yuh Ing} and Yeh, {Yih Hsiung} and Xiaoping Zeng",

note = "Funding Information: The authors wish to thank the guest editor of JSS008, JSS009 and JSS010 (EMSEV) Session at IUGG07 of Tectonophysics, Prof. Pier Francesco Biagi at the Physics Department, University of Bari, Bari, Italy for the invitation of paper submission. This study is partially supported by the project NSC98-2116-M-008-006-MY3 of the National Science Council to the National Central University. The authors thank the Institute of Earth Sciences, Academia Sinica at Taiwan for making the whole dataset behind the analysis of this paper available at ftp://ftp.earth.sinica.edu.tw/pub/Geomagnetic%20Data/ to anyone who is interested in and/or may want to check the results.",

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AU - Chen, Chieh Hung

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AU - Yen, Horng Yuan

AU - Hattori, Katsumi

AU - Liang, Wen Tzong

AU - Chen, Yuh Ing

AU - Yeh, Yih Hsiung

AU - Zeng, Xiaoping

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PY - 2010/6

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N2 - Many researchers studied the relationships between appearances of geomagnetic anomalies and their distances to earthquake epicenters or faults. Yet, occasionally some magnetometer stations located nearby earthquake epicenters and/or faults do not observe geomagnetic anomalies. In this paper, a new hybrid system which simultaneously takes the hypocenter and fault plane solution into account is constructed to examine 38 earthquakes interpreted to be associated with geomagnetic anomalies during the period 1988-2001 in Taiwan. The Surface Magnetic Anomaly Reference Tip (SMART) of the new system is used instead of the epicenter or the fault to investigate statistically the distance relationship between the anomalies and the earthquake parameters. Results show that the anomalies gather along the fault and in the belt zone to the SMART. Possible mechanisms causing the anomalies in the two zones are proposed and discussed. Characteristics of the anomaly might shed some light on locations of faults before earthquake occurrences.

AB - Many researchers studied the relationships between appearances of geomagnetic anomalies and their distances to earthquake epicenters or faults. Yet, occasionally some magnetometer stations located nearby earthquake epicenters and/or faults do not observe geomagnetic anomalies. In this paper, a new hybrid system which simultaneously takes the hypocenter and fault plane solution into account is constructed to examine 38 earthquakes interpreted to be associated with geomagnetic anomalies during the period 1988-2001 in Taiwan. The Surface Magnetic Anomaly Reference Tip (SMART) of the new system is used instead of the epicenter or the fault to investigate statistically the distance relationship between the anomalies and the earthquake parameters. Results show that the anomalies gather along the fault and in the belt zone to the SMART. Possible mechanisms causing the anomalies in the two zones are proposed and discussed. Characteristics of the anomaly might shed some light on locations of faults before earthquake occurrences.

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KW - Focal mechanism

KW - Geomagnetic field

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Pre-seismic geomagnetic anomaly and earthquake location

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Keywords

ASJC Scopus subject areas

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