Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project

  title={Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project},
  author={Kuo‐Fong Ma and Hidemi Tanaka and Sheng‐Rong Song and Chien Ying Wang and Jih-hao Hung and Yi Ben Tsai and James J. Mori and Yen-Fang Song and Eh-Chao Yeh and Wonn Soh and Hiroki Sone and Li‐Wei Kuo and Hung-Yu Wu},
Determining the seismic fracture energy during an earthquake and understanding the associated creation and development of a fault zone requires a combination of both seismological and geological field data. The actual thickness of the zone that slips during the rupture of a large earthquake is not known and is a key seismological parameter in understanding energy dissipation, rupture processes and seismic efficiency. The 1999 magnitude-7.7 earthquake in Chi-Chi, Taiwan, produced large slip (8… 

A Review of the 1999 Chi-Chi, Taiwan, Earthquake from Modeling, Drilling, and Monitoring with the Taiwan Chelungpu-Fault Drilling Project

Many high-quality strong motion stations were built prior to the occurrence of the destructive 1999 Chi-Chi earthquake, providing the most comprehensive study of the mechanism of such a damaging

Fault-Drilling Investigation of Earthquake Slip Behavior and Physicochemical Processes

Several fault-drilling projects have been conducted with the common aim of seeking direct access to zones of active faulting and understanding the fundamental processes governing earthquakes and

Mineralogy and magnetic properties of the 1999 Chi-Chi earthquake (Mw 7.6) slip zone and their implications

During an earthquake, the physical and the chemical transformations along a slip zone lead to alteration and formation of minerals within the gouge layer of a mature fault zone. The gouge contains

An earthquake slip zone is a magnetic recorder

During an earthquake, the physical and the chemical transformations along a slip zone lead to an intense deformation within the gouge layer of a mature fault zone. Because the gouge contains

Isotropic Events Observed with a Borehole Array in the Chelungpu Fault Zone, Taiwan

Using borehole array data collected along the low-stress Chelungpu fault zone, Taiwan, several small seismic events (I-type events) in a fluid-rich permeable zone directly below the impermeable slip zone of the 1999 moment magnitude 7.6 Chi-Chi earthquake are observed.

Physico-chemical processes in seismogenic faults: active and exhumed examples

The time recurrence of earthquakes is the result of the complex feedback between the tectonic loading on a fault and the time-dependent evolution of fault strength. The chemical and physical

Relationships Between Surface Ruptures and Lithologic Characteristics of the Wenchuan MS 8.0 Earthquake

Two co-seismic surface rupture zones, 230 km and 70 km long, are produced by the 2008 Wenchuan MS 8.0 earthquake along the pre-existing Yingxiu-Beichuan fault and the Guanxian-Anxian fault,

Fault-zone geology: lessons from drilling through the Nojima and Chelungpu faults

Abstract Several drilling projects have been conducted through active faults with the aim of learning about the geology of the fault zones and tentatively correlating the structure and mineralogy of



Detection of a recent earthquake fault by the shallow reflection seismic method

The 1999 Chi‐Chi earthquake in Taiwan was a relatively unique seismic event which activated the Chelungpu thrust fault with extraordinarily large surface ruptures up to 9.8 m horizontally and 5.6 m

Fracture surface energy of the Punchbowl fault, San Andreas system

Structural observations of the Punchbowl fault are quantified, and it is shown that the energy required to create the fracture surface area in the fault is about 300 times greater than seismological estimates would predict for a single large earthquake.

Frictional heat from faulting of the 1999 Chi‐Chi, Taiwan earthquake

The frictional heat generated during an earthquake is thought to be a major portion of the total energy release. However, there have been no direct measurements of the heat generated by a large

Earthquake slip weakening and asperities explained by thermal pressurization

This work shows that the discrepancy between laboratory and seismological results can be resolved if thermal pressurization of the pore fluid is the slip-weakening mechanism, and indicates that a planar fault segment with an impermeable and narrow slip zone will become very unstable during slip and is likely to be the site of a seismic asperity.

Mapping the northern portion of the Chelungpu fault, Taiwan by shallow reflection seismics

The Chelungpu fault was activated by the 1999 Chi‐Chi earthquake (Mw = 7.6), Taiwan. This fault exhibited extraordinarily large surface ruptures (up to 9.8 m) as well as underground fault slippages

Fault Structure Control on Fault Slip and Ground Motion during the 1999 Rupture of the Chelungpu Fault, Taiwan

The Chelungpu fault, Taiwan, ruptured in a Mw 7.6 earthquake on 21 September 1999, producing a 90-km-long surface rupture. Analysis of core from two holes drilled through the fault zone, combined

Evidence for fault lubrication during the 1999 Chi‐Chi, Taiwan, earthquake (Mw7.6)

The ground motion data of the 1999 Chi‐Chi, Taiwan, earthquake exhibit a striking difference in frequency content between the north and south portions of the rupture zone. In the north, the ground

The diversity of the physics of earthquakes

  • H. Kanamori
  • Geology
    Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
  • 2004
Earthquakes exhibit diverse characteristics. Most shallow earthquakes are “brittle” in the sense that they excite seismic waves efficiently. However, some earthquakes are slow, as characterized by

Fluidization and melting of fault gouge during seismic slip: Identification in the Nojima fault zone and implications for focal earthquake mechanisms

[1] The record of physical processes that occur during seismic slip events is well preserved in fault rocks from the active Nojima fault in Japan. The fault rocks formed at about 3 km depth, and

Initial Science Report of Shallow Drilling Penetrating into the Chelungpu Fault Zone, Taiwan

The Chelungpu fault, a reverse fault with left lateral component dipping moderately to the east, was activated by the Chi-Chi earthquake (Mw = 7.6) in 21 September, 1999 with maximum vertical and