The seismogenic deformation and Qp temporal variation before the M6.2 Mingjen earthquake, Taiwan

Wen, Strong; Chen, Chieh‐Hung; Ji, Yu-Jhe; Chang, Yi-Zen; Chen, Chau‐Huei

doi:10.1016/j.jseaes.2015.06.011

Cited by 2 publications

(1 citation statement)

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“…Changes of P-and S-wave attenuation (denoted by Q p and Q s , respectively) have been long considered as an earthquake precursor (e.g., Gusev and Lemzikov 1985;Sato 1986;Fremont and Poupinet 1987). Wen et al (2015) measured the temporal variation in Q p of P-waves from January 2009 to January 2010. Results show that the Q p began to decrease at all stations about 2 months before the 5 November 2009 M L 6.2 Ming-Jen earthquake.…”

Section: Q P Changesmentioning

confidence: 99%

A compilation of precursor times of earthquakes in Taiwan

Wang

2021

Terr. Atmos. Ocean. Sci.

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The precursor time, T, is the time interval between the occurrence time of a precursor and that of a forthcoming earthquake with local magnitude, M L . The precursors are classified into four types of earthquake prediction with different time windows: long-term prediction (T = 3 to 10 years); intermediate-term prediction (T = 6 months to 3 years); short-term prediction (T = 8 days to 6 months); and imminent prediction (T ≤ 7 days). Since the 1999 Chi-Chi earthquake, the precursors for numerous earthquakes in Taiwan have been observed and studied. The values of T and M L are compiled from scientific literature. The plots of T versus M L are made for some precursors when the data sets are large with the values of T for respective events. Such precursors are the b-value anomalies, foreshocks, thermal infrared radiation anomalies, geochemical composition changes, radon changes, γ-ray emission anomalies, and total electron content (TEC) anomalies. There is a positive correlation between T versus M L for the b-value anomalies, foreshocks, Rn changes, and γ-ray emissions. The relationship of log(T) versus M L is also inferred for Rn changes. The precursor time for Rn changes is positively correlated with that for γ-ray emissions. The time difference between the precursor time for Rn changes and that for γ-ray emissions is positively correlated to M L . However, the plots for thermal infrared radiation, geochemical composition changes, and TEC anomalies are quite scattered and thus not any correlation can be obtained. The positive correlations between T and M L or some precursors suggest the possibility of earthquake prediction in future.

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