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Stress interactions between normal faults and adjacent strike-slip faults of 1997 jiashi earthquake swarm

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Science China Earth Sciences 2008年第3期51卷 431-440页

作者： CHEN John YongShun Department of Geophysics School of Earth and Space Sciences Peking University China

During a 4-month period starting from 21 January, 1997, an earthquake swarm of seven major events (Ms≥6.0) struck the jiashi region at the northwestern corner of the Tarim Basin in Xinjiang,, China. Previous relocation studies suggested that these strong earthquakes had occurred along at least two parallel rupture zones. According to the relocated hypocenters and focal mechanisms of the events, we have constructed fault models for these seven earthquakes to calculate the Coulomb stress changes produced by each of these events. Furthermore, we extended our model calculations to include an ad- jacent 1996 Ms=6.9 Artushi earthquake, which occurred one year before the jiashi earthquake swarm. Our calculations show that the Coulomb stress change caused by the preceding events was around 0.05 MPa at the hypocenter of the 4th event, and higher than 0.08 MPa at the hypocenters of the 2nd, 3rd, 5th and 6th events. Our results reveal a Coulomb stress interactive cycle of earthquake triggering between two adjacent normal and strike-slip faults.

关键词： jiashi earthquake swarm normal fault strike-slip fault Coulomb stress change earthquake triggering

A priliminary study on the sequence characteristics and focal mechanism solution of the jiashi strong earthquake swarm

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Acta Seismologica Sinica(English Edition) 1998年第6期11卷 16-23页

作者： XIN YANG GUO YING GAO Seismological Bureau of Xinjiang Uygur Autonomous Region, rümqi 830011, China 1. Seismological Bureau of Xinjiang Uygur Autonomous Region 830011 ürümqi China

The sequence characteristics and focal mechanism solution of the jiashi, Xinjiang strong earthquake swarm are analyzed and studied in this paper. The result shows that before the M S=6.6 earthquake, value h of sequence frequency attenuation coefficient was less than 1, then value h was more than 1. Before occurrence of M S6.0 earthquakes the energy is released either in a continuously strengthened way or a sharply strengthened way, and before M S5.0 earthquakes the sequence frequency shows calm. The study on the focal mechanism solution of the strong earthquake swarm shows that the source faults are mainly in a right lateral, strike slip way and the faults have characteristics of tensor shear.

关键词： earthquake swarm sequence characteristics focal mechanism solution focal displacement feature jiashi

The Strong Earthquake Swarm in jiashi, Xinjiang in 1997 and Three Successful Predictions of Impending Earthquakes

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Earthquake Research in China 1998年第4期12卷 14-29页

作者： Zhu Lingren, Su Naiqin, and Yang MalingSeismological Bureau of Xinjiang Uygur Autonomous Region, Urumqi 830011, China

A strong earthquake swarm including 7 earthquakes with M≥6.0 occurred in jiashi, Xinjiang region from January to April, 1997, which is rare for intraplate seismicity. They occurred in Tarim Basin which is relatively stable, has no discovered surface rupture and where the deep-seated tectonics are not clear. The Seismological Bureau of Xinjiang Region has made three successful impending predictions for the strong aftershocks and succeeding earthquakes in jiashi. The injuries and deaths of people have been greatly reduced because of effective measures taken by the local government, and the social and economic results are remarkable. The article introduces a summary of the strong earthquake swarm and the main processes of the prediction, sums up the scientific bases of an impending prediction, and shows that the occurrence of the jiashi strong earthquake swarm revealed some important scientific problems which should be studied further. The practice of the jiashi earthquake prediction indicates again

关键词： jiashi Earthquake Prediction.

Characters of variation of LURR during the earthquake sequence of Xinjiang

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Chinese Science Bulletin 1998年第20期43卷 1752-1755页

作者： Haitao Wang Keyin Peng Yongxian Zhang Yucang Wang Xiangchu Yin Xinjiang Seismol Bur Urumqi 830011 Peoples R China State Seismol Bur Ctr Analyt & Predict Beijing 100036 Peoples R China State Seismol Bur Inst Geophys Beijing 100081 Peoples R China Chinese Acad Sci Inst Mech Lab Nonlinear Mech Beijing 100080 Peoples R China

The theory of the loading/unloading response ratio (LURR) was applied to the jiashi earthquake sequence which occurred at the beginning of 1997 in Xinjiang, and found that, before the earthquakes with relatively high magnitudes in the sequence, the ratio showed anomalies of high values. That is to say, the LURR theory can be applied to the short_term earthquake prediction in some cases, especially in the early period after a strong earthquake, such as the forecasts for some strong earthquakes in the jiashi sequence.

关键词： jiashi earthquake sequence theory of loading/unloading response ratio (LURR) earthquake sequence.