Characteristic repeating earthquakes in an arc-continent collision boundary zone: The Chihshang fault of eastern Taiwan

Kate Huihsuan Chen, Robert M. Nadeau, Ruey-Juin Rau

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Creeping crustal faults often generate a large number of microearthquakes, and less commonly, they may also produce major earthquakes that rupture the brittle crust. The Chihshang fault in eastern Taiwan is characterized by such behavior and has been known to undergo 2-3 cm/yr surface creep, making it one of the most active creeping thrust faults known in the world. It gives an excellent opportunity to study how a creeping fault can generate large earthquakes. However, the understanding of fault behavior at depth in this area has been limited due to sparse sampling from seismic and geodetic stations. In this study we determine and evaluate a population of repeating earthquakes to improve the understanding of deep fault deformation. We propose a repeating sequence identification scheme in the region where the station coverage is sparse and one-sided. Using this identification method, we found 30 M 2-3 characteristic repeating sequences under the northern half of the Chihshang fault at 7-23 km depth. Slip estimates from these sequences indicate an average slip rate of ∼ 3 cm/yr, which is consistent with the rate inferred from surface geodetic measurements. We infer that the 30-km-long Chihshang fault is creeping along its northern half and locked in the south, consistent with the occurrence of the 2003 ML 6.4 earthquake on the southern fault section.

Original languageEnglish
Pages (from-to)262-272
Number of pages11
JournalEarth and Planetary Science Letters
Volume276
Issue number3-4
DOIs
Publication statusPublished - 2008 Dec 15

Fingerprint

arc-continent collision
Taiwan
continents
Earthquakes
earthquakes
arcs
earthquake
collisions
slip
stations
crusts
Creep
sampling
occurrences
Sampling
earthquake rupture
identification method
microearthquake
slip rate
estimates

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

@article{a2f39b189ecd487083269a31f2c123b6,
title = "Characteristic repeating earthquakes in an arc-continent collision boundary zone: The Chihshang fault of eastern Taiwan",
abstract = "Creeping crustal faults often generate a large number of microearthquakes, and less commonly, they may also produce major earthquakes that rupture the brittle crust. The Chihshang fault in eastern Taiwan is characterized by such behavior and has been known to undergo 2-3 cm/yr surface creep, making it one of the most active creeping thrust faults known in the world. It gives an excellent opportunity to study how a creeping fault can generate large earthquakes. However, the understanding of fault behavior at depth in this area has been limited due to sparse sampling from seismic and geodetic stations. In this study we determine and evaluate a population of repeating earthquakes to improve the understanding of deep fault deformation. We propose a repeating sequence identification scheme in the region where the station coverage is sparse and one-sided. Using this identification method, we found 30 M 2-3 characteristic repeating sequences under the northern half of the Chihshang fault at 7-23 km depth. Slip estimates from these sequences indicate an average slip rate of ∼ 3 cm/yr, which is consistent with the rate inferred from surface geodetic measurements. We infer that the 30-km-long Chihshang fault is creeping along its northern half and locked in the south, consistent with the occurrence of the 2003 ML 6.4 earthquake on the southern fault section.",
author = "Chen, {Kate Huihsuan} and Nadeau, {Robert M.} and Ruey-Juin Rau",
year = "2008",
month = "12",
day = "15",
doi = "10.1016/j.epsl.2008.09.021",
language = "English",
volume = "276",
pages = "262--272",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",
number = "3-4",

}

Characteristic repeating earthquakes in an arc-continent collision boundary zone : The Chihshang fault of eastern Taiwan. / Chen, Kate Huihsuan; Nadeau, Robert M.; Rau, Ruey-Juin.

In: Earth and Planetary Science Letters, Vol. 276, No. 3-4, 15.12.2008, p. 262-272.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characteristic repeating earthquakes in an arc-continent collision boundary zone

T2 - The Chihshang fault of eastern Taiwan

AU - Chen, Kate Huihsuan

AU - Nadeau, Robert M.

AU - Rau, Ruey-Juin

PY - 2008/12/15

Y1 - 2008/12/15

N2 - Creeping crustal faults often generate a large number of microearthquakes, and less commonly, they may also produce major earthquakes that rupture the brittle crust. The Chihshang fault in eastern Taiwan is characterized by such behavior and has been known to undergo 2-3 cm/yr surface creep, making it one of the most active creeping thrust faults known in the world. It gives an excellent opportunity to study how a creeping fault can generate large earthquakes. However, the understanding of fault behavior at depth in this area has been limited due to sparse sampling from seismic and geodetic stations. In this study we determine and evaluate a population of repeating earthquakes to improve the understanding of deep fault deformation. We propose a repeating sequence identification scheme in the region where the station coverage is sparse and one-sided. Using this identification method, we found 30 M 2-3 characteristic repeating sequences under the northern half of the Chihshang fault at 7-23 km depth. Slip estimates from these sequences indicate an average slip rate of ∼ 3 cm/yr, which is consistent with the rate inferred from surface geodetic measurements. We infer that the 30-km-long Chihshang fault is creeping along its northern half and locked in the south, consistent with the occurrence of the 2003 ML 6.4 earthquake on the southern fault section.

AB - Creeping crustal faults often generate a large number of microearthquakes, and less commonly, they may also produce major earthquakes that rupture the brittle crust. The Chihshang fault in eastern Taiwan is characterized by such behavior and has been known to undergo 2-3 cm/yr surface creep, making it one of the most active creeping thrust faults known in the world. It gives an excellent opportunity to study how a creeping fault can generate large earthquakes. However, the understanding of fault behavior at depth in this area has been limited due to sparse sampling from seismic and geodetic stations. In this study we determine and evaluate a population of repeating earthquakes to improve the understanding of deep fault deformation. We propose a repeating sequence identification scheme in the region where the station coverage is sparse and one-sided. Using this identification method, we found 30 M 2-3 characteristic repeating sequences under the northern half of the Chihshang fault at 7-23 km depth. Slip estimates from these sequences indicate an average slip rate of ∼ 3 cm/yr, which is consistent with the rate inferred from surface geodetic measurements. We infer that the 30-km-long Chihshang fault is creeping along its northern half and locked in the south, consistent with the occurrence of the 2003 ML 6.4 earthquake on the southern fault section.

UR - http://www.scopus.com/inward/record.url?scp=56549104559&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=56549104559&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2008.09.021

DO - 10.1016/j.epsl.2008.09.021

M3 - Article

AN - SCOPUS:56549104559

VL - 276

SP - 262

EP - 272

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

IS - 3-4

ER -