Seismicity Controlled by a Frictional Afterslip During a Small-Magnitude Seismic Sequence ( M L < 5) on the Chihshang Fault, Taiwan - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research : Solid Earth Année : 2018

Seismicity Controlled by a Frictional Afterslip During a Small-Magnitude Seismic Sequence ( M L < 5) on the Chihshang Fault, Taiwan

Résumé

We report evidence for frictional afterslip at shallow depths (about 5 to 7 km) during a small‐magnitude seismic sequence (with ML<5) along the Chihshang Fault, a main active structure of the Longitudinal Valley, in southeast Taiwan. The afterslip, which was recorded by a nearby borehole dilatometer, lasted about a month with a cumulative geodetic moment magnitude of 4.8 ± 0.2. The afterslip comprised two stages and controlled the aftershock sequence. The first postseismic stage, which followed a ML 4.6 earthquake, lasted about 6 h and mostly controlled the ruptures of neighboring asperities (e.g., multiplets) near the hypocenter. Then, a 4 week duration large afterslip event following a ML 4.9 earthquake controlled the rate of aftershocks during its first 2 days through brittle creep. The study presents a rare case of simultaneous seismological and geodetic observations for afterslip following earthquakes with magnitude lower than 5. Furthermore, the geodetic moment of the postseismic phase is at least equivalent to the coseismic moment of the sequence.
Fichier principal
Vignette du fichier
2017JB015128.pdf (2.68 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-01856082 , version 1 (01-12-2021)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Alexandre Canitano, Maxime Godano, Ya-Ju Hsu, Hsin-Ming Lee, Alan Linde, et al.. Seismicity Controlled by a Frictional Afterslip During a Small-Magnitude Seismic Sequence ( M L < 5) on the Chihshang Fault, Taiwan. Journal of Geophysical Research : Solid Earth, 2018, 123 (2), pp.2003 - 2018. ⟨10.1002/2017JB015128⟩. ⟨hal-01856082⟩
54 Consultations
65 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More