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Preliminary numerical simulation of potential earthquake-induced tsunami in East China Sea

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earthquake Science 2008年第5期21卷 456-463+553页

作者：温燕林朱元清宋治平薛艳刘双庆董非非 earthquake administration of shanghai municipality Institute of Geophysics China Earthquake Administration

In this paper,we present a numerical simulation of the propagation of a tsunami in the East China Sea,which might be induced by a hypothetical M8.5 earthquake in Okinawa Trough. Our results show that the initial maxi-mum wave height of tsunami could reach as high as 4.3 m for the hypothetical earthquake. It would take 3.5～4 hours for the tsunami to propagate to the coast of Zhejiang Province,and 7～8 hours to the near-shore of shanghai. The peak tsunami height could be up to about 2 m in the coast of Zhejiang Province. Based on the numerical ex-periments,we plot the arrival time contours of tsunami in East China Sea and time history curves on the three ob-servational stations,and discussed the significance of the pre-analysis.

关键词： potential tsunami numerical simulation maximum tsunami height arrival time contours

The characteristics of Quaternary activity of faults in the sea area near the Yangtze River mouth

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Acta Seismologica Sinica(English Edition) 2004年第4期17卷 473-479页

作者： ZHANG Zhen-quan(章振铨) HUO En-jie(火恩杰) LIU Chang-sen(刘昌森) WANG Feng(王锋) earthquake administration of shanghai municipality Shanghai 200062 China Earthquake Administration of Shanghai Municipality Shanghai 200062 China Earthquake Administration of Shanghai Municipality Shanghai 200062 China Earthquake Administration of Shanghai Municipality Shanghai 200062 China

By shallow seismic prospecting, it is showed that the faults in the sea area near the Yangtze River mouth are mainly the NE and NW-trending faults. The main activity time of fault is Pliocene to Early Pleistocene, and the latest activity is up to Middle Pleistocene. The maximum of fault is generally several tens meters with the throw decreased upward. The dislocation near the bottom of Middle Pleistocene is 12~13 m. The average vertical dis-placement rate is on a level of 10-3 mm/a.

关键词： fault activity sea area near the Yangtze River mouth

Characteristics of seismic activity before several large Sumatra, Indonesia, earthquakes

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Acta Seismologica Sinica(English Edition) 2008年第3期21卷 325-329,333页

作者：薛艳宋治平梅世蓉马宏生 Institute of Geophysics China Earthquake Administration earthquake administration of shanghai municipality Institute of earthquake Science China Earthquake Administration

Two great earthquakes of MS8.5 and MS8.3 determined by the China earthquake Networks Center (CENC) occurred successively on September 12 and 13, 2007 in the sea area to the south of Sumatra, which is another group of ... 详细信息

关键词： seismic gap strengthened seismic activity deep earthquake activity Wadati-Benioff belt

Study on the Precise Location of the Xinjiang Yutian M_S7.3 earthquake

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earthquake Research in China 2015年第1期29卷 57-67页

作者： Zhan Xiaoyan Song Xiuqing Chen Xiangjun Wang Jun Miao Fajun Liu Shuangqing Zhu Yuanqing earthquake administration of Jiangsu Province earthquake administration of shanghai municipality earthquake administration of Xinjiang Uygur Autonomous Region earthquake administration of Tianjin municipality

The seismic waveform of the Yutian Ms7. 3 earthquake, Xinjiang on February 12, 2014 was recorded clearly and completely by the Digital Seismic Networks of Xinjiang, Qinghai, Tibet, and Xinjiang Hotan array, so the method of joint location by regional seismic network and seismic array can be used to accurately determine the earthquake source location. The following technologies were used in the process of location：（ 1 ） We selected seismic stations equally located around the epicenter of the Ms 7. 3 earthquake with an average interval of about 15 degrees in the initial location. （2） The recording waveforms of Yutian seismic station were rotated to the radial and tangential directions to precisely obtain the arrival time of S-waves to determine the epicentral distance. （ 3） The velocity model was used in the determination of location of the epicenter, based on the historical records of earthquakes in the area within a radius of 1.0 ° from the source as the center, and the velocity model is obtained after re-fitting and calibration. （4） Based on the waveform records of the Hotan seismic array, the method of waveform beaming was used to determine the azimuths and perform the correction of the epicenter location with these azimuths. （5） The deterministic method was used to measure the source depth. Finally, it is concluded that the Yutian Ms 7. 3 main shock hypocenter location is 36. 197°N, 82. 467°E, focal depth 12km and original time 17：19：48. 2 μm. February 12, 2014.

关键词： Hypocentral location Digital seismic network Seismic array

Large, moderate, small earthquakes and seismic fortification criterion

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Acta Seismologica Sinica(English Edition) 2004年第5期17卷 589-595页

作者： SHEN Jian-wen(沈建文) SHI Shu-zhong(石树中) earthquake administration of shanghai Shanghai200062China Earthquake Administration of ShanghaiShanghai200062China

This paper discusses the relation between two-step seismic design and the standard of probability of exceedance, and the relation of three-levels seismic ground motion parameters given by probability method and comprehensive probability method. The relative size relations of the ground motions with 2%, 10%, 63% probability of exceedance in 50 years, namely large earthquake, moderate earthquake, and small earthquake, are discussed through a practical example of seismic hazard analysis. The methods to determine seismic fortification criterion are discussed.

关键词： Seismic safety evaluation seismic fortification criterion earthquake resistance and disaster mitigation

Study on the variation characteristics of the geoelectric field preceding earthquakes

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Acta Seismologica Sinica(English Edition) 2004年第3期17卷 334-343页

作者： MA Qin-zhong(马钦忠) FENG Zhi-sheng(冯志生) SONG Zhi-ping(宋治平) ZHAO Wei-guo(赵卫国) earthquake administration of shanghai Shanghai 200062 China Earthquake Administration of Jiangsu Nanjing 210014 China Earthquake Administration of Shanghai Shanghai 200062 China Earthquake Administration of Wenxian Gansu Wenxian 746400 China

earthquake events occurred in Nantong, Jiangsu Province on Nov. 3, and Dec. 25, 2001 in which the biggest mag-nitudes were ML=3.8 and ML=4.1, respectively. This paper firstly explains the principle of the eliminating noise method by the multi-dipole observation system of geoelectric field. Then based on the observation data of the multi-dipole observation system obtained by ZD9A telluric current monitors installed in Chongming and Nanjing stations, we study the abnormal variation of the geoelectric field preceding the earthquakes. The study shows that: a) Eliminating noise method of multi-dipole observation is an excellent method by which many kinds of geoelec-tric field noises can be eliminated successfully and the geoelectric precursor information can be recognized; b) The geoelectric precursor signals for the events were recorded on the NS and NE dipoles in Chongming station 42 days, 20 days and 2 days before the earthquakes respectively, in which the station is near the epicenter, and the longest time of persisting period was 9 days. The abnormal variation signals of geoelectric field observed in Nanjing sta-tion are all the noises but not the seismic electric signals, in which the station is not near the epicenter; c) Dipole distribution method of common electrode is not good in the multi-dipole observation system of the geoelectric field.

关键词： earthquake geoelectric field multi-dipole observation system eliminating noise method

Seismotectonics of the 2008 and 2009 Qaidam earthquakes and its Implication for Regional Tectonics

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Acta Geologica Sinica(English Edition) 2013年第2期87卷 618-628页

作者： CHEN Guihua XU Xiwei ZHU Ailan ZHANG Xiaoqing YUAN Renmao Yann KLINGER Jean-Mathieu NOCQUET Key Laboratory of Active Tectonics and Volcano Institute of Geology China Earthquake Administration Tectonics Observatory California Institute of Technology earthquake administration of shanghai municipality earthquake administration of Qinghai Province Institut de Physique du Globe CNRS Geoscience Azur

Three magnitude 〉6 earthquakes struck Qaidam, Qinghai province, China, in November 10th 2008, August 28th and 31st 2009 respectively. The Zongwulongshan fault has often been designated as the active seismogenic structure, although it is at odd with the data. Our continuous GPS station （CGPS）, the Xiao Qaidam station, located in the north of the Qaidam basin, is less than 30 km to the southwest of the 2008 earthquake. This CGPS station recorded the near field co-seismic deformation. Here we analyzed the co-seismic dislocation based on the GPS time series and the rupture processes from focal mechanism for the three earthquakes. The afiershocks were relocated to constrain the spatial characteristics of the 2008 and 2009 Qaidam earthquakes. Field geological and geomorphological investigation and interpretation of satellite images show that the Xitieshan fault and Zongwulongshan fault were activated as left lateral thrust during the late Quaternary. Evidence of folding can also be identified. Integrated analyses based on our data and the regional tectonic environment show that the Xitieshan fault is the fault responsible for the 2008 Qaidam earthquake, which is a low dip angle thrust with left lateral strike slip. The Zongwulongshan fault is the seismogenic fault of the 2009 earthquakes, which is a south dipping back thrust of the northern marginal thrust system of the Qaidam basin. Folding takes a significant part of the deformation in the northern marginal thrust system of the Qaidam basin, dominating the contemporary structure style of the northern margin of the Qaidam basin and Qilianshan tectonic system. In this region, this fault and fold system dominates the earthquake activities with frequent small magnitude earthquakes.

关键词： Qaidam earthquakes seismotectonics Xitieshan fault Zongwulongshan fault structure style

Characteristics of seismic activity before the M_S8.0 Wenchuan earthquake

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earthquake Science 2009年第5期22卷 519-529页

作者： Yan Xue Jie Liu Shirong Mei Zhiping Song Institute of Geophysics China Earthquake Administration Beijing 100081 China China earthquake Networks Center Beijing 100045 China Institute of earthquake Science China Earthquake Administration Beijing 100036 China earthquake administration of shanghai municipality Shanghai 200062 China

The characteristics of spatio-temporal seismicity evolution before the Wenchuan earthquake are studied. The results mainly involve in the trend abnormal features and its relation to the Wenchuan earthquake. The western Chinese mainland and its adjacent area has been in the seismically active period since 2001, while the seismic activity shows the obvious quiescence of M≥7.0, M≥6.0 and M≥5.0 earthquakes in Chinese mainland. A quiescence area with M≥7.0 has been formed in the middle of the North-South seismic zone since 1988, and the Wenchuan earthquake occurred just within this area. There are a background seismicity gap of M≥5.0 earthquakes and a seismogenic gap of ML〉4.0 earthquakes in the area of Longrnenshan fault zone and its vicinity prior to the Wenchuan earthquake. The seismic activity obviously strengthened and a doughnut-shape pattern of M≥4.6 earthquakes is formed in the middle and southern part of the North-South seismic zone after the 2003 Dayao, Yunnan, earthquake. Sichnan and its vicinity in the middle of the doughnut-shape pattern show abnormal quiescence. At the same time, the seismicity of earthquake swarms is significant and shows heterogeneity in the temporal and spatial process. A swarm gap appears in the M4.6 seismically quiet area, and the Wenchuan earthquake occurred just on the margin of the gap. In addition, in the short term before the Wenchuan earthquake, the quiescence of earthquake with ML≥4.0 appears in Qinghai-Tibet block and a seismic belt of ML〉3.0 earthquakes, with NW striking and oblique with Longmenshan fault zone, is formed.

关键词： Wenchuan earthquake background seismicity gap seismogenic gap earthquake swarm seismic belt quiescence

Statistical study on great geomagnetic storms during solar cycle 23

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earthquake Science 2011年第4期24卷 365-372页

作者： Qi Li Yufen Gao Peiyu Zhu Huaran Chen Xiuling Zhang Institute of Geophysics China Earthquake Administration Beijing 100081 China Chongming Observatory Earthquake Administration of Shanghai Municipality Shanghai 202164 China Beijing Observatory Institute of Geophysics China Earthquake Administration Beijing 100095 China

Characteristics of great geomagnetic storms during solar cycle 23 were statistically investigated. Firstly, we focused on the uniqueness of solar cycle 23 by analyzing both the great storm number and sunspot number from 1957 to 2008. It was found that the relationship between the sunspot number and great storm number weakened as the activity of the storms strengthened. There was no obvious relationship between the annual sunspot number and great storm number with Dst≤-300 nT. Secondly, we studied the relationship between the peak Dst and peak Bz in detail. It was found that the condition Bz〈-10 nT is not necessary for storms with Dst≤-100 nT, but seems necessary for storms with Dst≤-150 nT. The duration for Bz≤-10 nT has no direct relationship with the giant storm. The correlation coefficient between the Dst peak and Bz peak for the 89 storms studied is 0.81. After removing the effect of solar wind dynamic pressure on the Dst peak, we obtained a better correlation coefficient of 0.86. We also found the difference between the Dst peak and the corrected Dst peak was proportional to the Dst peak.

关键词： geomagnetic storms solar cycle 23 sunspot number 4.5 solar cycles peak Dst andpeak Bz