Abstract
Three earthquake sequences, each with two main earthquakes of almost the same magnitudes (ML from 5.9 to 7.0 with differences less than 0.1), have recently been observed in Taiwan. The two largest earthquakes in each sequence occurred with a short delay time between them, were strikingly similar in terms of magnitude, location and/or focal mechanism and are referred to as doublets. They were markedly distinct from typical single mainshock sequences. Our estimated static stress field generated by the first shock in the doublet shows that the second shock and most of their aftershocks were located within a region where static stress increased substantially. Thus, a possible explanation for earthquake doublet is that seismic energy for each shock had accumulated independently within adjacent crustal volumes, separated by an asperity, and that the second shock is triggered by the increased static stress after the first one. An important implication of doublet sequence is that works by emergency response teams after the first earthquake could be made more hazardous by the second.
| Original language | English |
|---|---|
| Pages (from-to) | 589-594 |
| Number of pages | 6 |
| Journal | Terrestrial, Atmospheric and Oceanic Sciences |
| Volume | 19 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2008 Dec 1 |
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Keywords
- Aftershocks
- Doublet earthquake
- Static triggering
ASJC Scopus subject areas
- Oceanography
- Atmospheric Science
- Earth and Planetary Sciences (miscellaneous)
Cite this
Earthquake doublet sequences : Evidence of static triggering in the strong convergent zones of Taiwan. / Lin, Cheng Horng; Yeh, Yih Hsiung; Ando, Masataka; Chen, Kuang Jung; Chang, Tao Ming; Pu, Hsin Chieh.
In: Terrestrial, Atmospheric and Oceanic Sciences, Vol. 19, No. 6, 01.12.2008, p. 589-594.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Earthquake doublet sequences
T2 - Evidence of static triggering in the strong convergent zones of Taiwan
AU - Lin, Cheng Horng
AU - Yeh, Yih Hsiung
AU - Ando, Masataka
AU - Chen, Kuang Jung
AU - Chang, Tao Ming
AU - Pu, Hsin Chieh
PY - 2008/12/1
Y1 - 2008/12/1
N2 - Three earthquake sequences, each with two main earthquakes of almost the same magnitudes (ML from 5.9 to 7.0 with differences less than 0.1), have recently been observed in Taiwan. The two largest earthquakes in each sequence occurred with a short delay time between them, were strikingly similar in terms of magnitude, location and/or focal mechanism and are referred to as doublets. They were markedly distinct from typical single mainshock sequences. Our estimated static stress field generated by the first shock in the doublet shows that the second shock and most of their aftershocks were located within a region where static stress increased substantially. Thus, a possible explanation for earthquake doublet is that seismic energy for each shock had accumulated independently within adjacent crustal volumes, separated by an asperity, and that the second shock is triggered by the increased static stress after the first one. An important implication of doublet sequence is that works by emergency response teams after the first earthquake could be made more hazardous by the second.
AB - Three earthquake sequences, each with two main earthquakes of almost the same magnitudes (ML from 5.9 to 7.0 with differences less than 0.1), have recently been observed in Taiwan. The two largest earthquakes in each sequence occurred with a short delay time between them, were strikingly similar in terms of magnitude, location and/or focal mechanism and are referred to as doublets. They were markedly distinct from typical single mainshock sequences. Our estimated static stress field generated by the first shock in the doublet shows that the second shock and most of their aftershocks were located within a region where static stress increased substantially. Thus, a possible explanation for earthquake doublet is that seismic energy for each shock had accumulated independently within adjacent crustal volumes, separated by an asperity, and that the second shock is triggered by the increased static stress after the first one. An important implication of doublet sequence is that works by emergency response teams after the first earthquake could be made more hazardous by the second.
KW - Aftershocks
KW - Doublet earthquake
KW - Static triggering
UR - http://www.scopus.com/inward/record.url?scp=60249094598&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=60249094598&partnerID=8YFLogxK
U2 - 10.3319/TAO.2008.19.6.589(PT)
DO - 10.3319/TAO.2008.19.6.589(PT)
M3 - Article
AN - SCOPUS:60249094598
VL - 19
SP - 589
EP - 594
JO - Terrestrial, Atmospheric and Oceanic Sciences
JF - Terrestrial, Atmospheric and Oceanic Sciences
SN - 1017-0839
IS - 6
ER -