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Wang Xinling 《中国地震研究》2006,20(1):37-49
INTRODUCTIONEarthquake sequence is a series of centralized earthquake events in space-time after a largerearthquake.Since these earthquake events occur in a small space and are sequential in one specialtime,their seismogenic structure,mediumcharacteristics and earthquake mechanisms must be similar.By studying one earthquake sequence,the seismic activitytrend after a large earthquake can beconjectured.Some characteristics of the earthquake source development process and physic states canal… 相似文献
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1 .ＥＳＴＡＢＬＩＳＨＭＥＮＴＯＦＡＭＵＬＴＩ ＤＩＳＣＩＰＬＩＮＡＲＹＳＹＳＴＥＭＦＯＲＭＯＮＩＴＯＲＩＮＧＥＡＲＴＨＱＵＡＫＥＳＡＮＤＰＲＥＣＵＲＳＯＲＳ Ａｍｕｌｔｉ ｄｉｓｃｉｐｌｉｎａｒｙｓｙｓｔｅｍｈａｓｂｅｅｎｓｅｔｕｐｔｏｍｏｎｉｔｏｒｅａｒｔｈｑｕａｋｅｓａｎｄｐｒｅｃｕｒｓｏｒｓｓｏａｓｔｏｐｒｏ ｖｉｄｅａｓｕｒｖｅｉｌｌａｎｃｅｂａｓｅｆｏｒｅａｒｔｈｑｕａｋｅｆｏｒｅｃａｓｔｉｎｇ .Ｔｈｅｅｓｔａｂｌｉｓｈｍｅｎｔｏｆａｍｕｌｔｉ ｄｉｓｃｉｐｌｉｎａｒｙｓｙｓｔｅｍｆｏ… 相似文献
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China is the country with the most earthquakes and the most serious hazards from continental earthquakes in the world.During the 1960s and 1970s,a series of strong earthquakes attacked the cities and counties in China causing great damage and many casualties.The most striking one was the Tangshan earthquake(Ms7.8) in July 1976,in which over 240,000 people died and a large industrial city was leveled.Public demand for earthquake forecasting surged after this disaster.From the mid-1960s,systemic research on earthquake forecasting has evolved throughout the country,In this paper the main advances in earthquake prediction research in China have been summarized. 相似文献
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Wang Xinling 《中国地震研究》2006,20(1):37-49
The Yao＇an Ms6.5 earthquake occurred on Jan. 15, 2000 and the Yongsheng Ms6.0 earthquake occurred on Oct. 27, 2001 in Yunnan Province, China. They are both located in the middle of the Dian block. Their epicenters are close to each other, the tectonic and strain characters of the earthquakes were similar, and there were many aftershocks after the two main shocks. In order to further study the spatial-temporal distributions and fault rupture characters of the main shocks and aftershocks, the latter are located using the Geiger earthquake location algorithm （Geiger） and the double difference earthquake location algorithm （DD） based on the seismic phase data of the two earthquake sequences. They were recorded by two Near Source Digital Seismic Networks （YNSSN and YSNSSN） deployed by the Yunnan Seismological Bureau （YNSB）. Then, two main shock parameters were relocated using DD based on the data of larger magnitude aftershocks and the two main shocks that were recorded by the Kunming Regional Digital Seismic Network （KMSN）. Combining the spatial- temporal distributions of the two earthquake sequences, the tectonic and strain characters of earthquakes, the rupture processes of the two aftershock sequences along faults are analyzed and discussed contrastively. 相似文献
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Introduction Some earthquake precursors can be obtained by analyzing the local vertical variation through monitoring the residual anomalies of both universal time and latitude obtained by astrometric observations, and such a view has been verified by different earthquakes (LI, et al, 1978; HAN, 1993). The deviation and increment of local plumb line are possibly caused by the change of direction of gravity acceleration that aroused by ground mass activities before earthquakes. The other part … 相似文献
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《地震学报(英文版)》2009,(1)
正Understanding the mechanisms which cause earthquakes and thus earthquake prediction,is inherently difficult in comparison to other physical 相似文献
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Through the accurate determination of hypocenter location,the measurement of the main focal mechanism solutions and the analyses of time dependent processes for Sichuan Mianzhu earthquake sequence with Ms=5.0 occurred along the middle segment of Longmenshan fault zone on November 30,1999,the distribution of focal depth section,the stress relase and seismicity features are given to reveal the earthquake-geneating structure of the earthquake sequence.The obtained results show the activity features for this sequence as follows:(1) There is no obvious foreshock,the accumulated strain energy releases in nearly pulse way,fluctuation of the seismic activity level is not quite evident during the duration of the sequence,and the statistical relation between the large events and the small events is less compatible with the traditional G-R estimation;(2) The epicenters of the earthquake sequence are not distributed on the main Longmenshan piedmont faults emerging out ground,but near the hidden Longmenshan piedmont faults.The direction of epicenter distribution is not very coincident with the fault strikes.The microscopic epicenters are relatively far from the macroscopic epicenters,The focal depths range from 5km to 16km;(3) The fractures of focal fault plane with the NE strike appear out the strike-slip displacement with a few overthrust components under the major principal compressive stress of NNE direction.From these,we consider it should be paid more attentions to the underground hidden faults near the ground fault zone on a large scale for their generating earthquake risk. 相似文献
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By combining conventional grey correlation analysis,grey clustering method and grey forecasting methods with our multi-goal forecast thoughts and the techniques of grey time series processing,we develop six different grey earthquake forecast models in this paper,Using the record of major earthquakes in Japan from 1872 to 1995,we forecast future earthquakes in Japan.We develop an earthquake forecast model.By using the major earthquakes in Japan from 1872 to 1984,we forecast earthquakes from 1985 to 1995 and check the precision of the grey earthquake models.We find that the grey system theory can be applied to earthquake forecast.We introduce the above analysis methods and give a real example to evaluate and forecast.We also further discuss the problems of how to improve the precision of earthquake forecast and how to strengthen the forecast models in future research. 相似文献
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The temporal-spatial distribution of mid-small earthquakes in Italy and its surroundings from January 1 to April 5,2009 shows that there were significant foreshocks before the moderate L'Aquila earthquake of April 6,2009.The enhancement of frequency and intensity of small earthquakes and their concentrating tendency to the future main shock have provided a comprehensive case for digging methods of earthquake forecasting with foreshocks. 相似文献
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Xu Daoyi Wang Xiangnan Zhou ShengkuiInstitute of Geology SSB Beijing ChinaCenter for Analysis Prediction SSB Beijing China 《中国地震研究》1994,(4)
A theory on information prediction process proposed by Weng Wenpo(1991)is applied to the earthquake prediction decision process.Four cycles represent the theory(conception),earthquake prediction decision result,anomalies,and earthquake assemblage,respectively.The interception and overlapping of the four cycles indicate different combinations,resulting in formation of 13 regions.In the case of decision conclusion on earthquake to occur,seven decision results of different characters are distinguished.The six other results were obtained in the case of absence of decision.Results of four characters show correct decision on earthquake to occur and those of three characters show the erroneous decision on earthquake to occur.Until now,theories of earthquake prediction have been incomplete,and the coincidence ratio of decision on earthquake to occur is also considerably low.Systematic analysis of the decision process is beneficial to understanding the causes for missing,virtual,pseudo,false,and correct earthqua 相似文献
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Tocelebratethe100AnniversaryoftheInternationalAssociationofSeismology(nowInternationalAssociationofSeismologyandPhysicsoftheEarthsInterior,IASPEI),theInternationalHandbookofEarthquakeandEngi-neeringSeismology,Volumes1and2,werepublishedbyAcademicPressin2002and2003,respectively.ThisHandbookisoneoftheprojectsofIASPEICommitteeonEducation(nowCommissiononEducationandOutreach),incollaborationwiththeInternationalAssociationforEarthquakeEngineering(IAEE).Thiscomprehensivereferencesumma… 相似文献
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The principles are summarized in this paper for tackling problems related with the verification of historic earthquake records so as to enable proper utilization of the rich historic data of China.Case studies furnished in this paper show that those principles could be effectively utilized to solve the puzzling problems encountered in studying the historic earthquake data.The principles listed in this paper might also be used to tackle problems associated with the historic records of other branches of science. 相似文献
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Liu Wei An Weiping Zhao XinpmgSetomological Bureau of Shanxi Province Taiyuan China 《中国地震研究》1994,(3)
In this paper,the basic conditions and characteristics of the Datong-Yanggao earthquake are described in detail.The type of the earthquake,the aftershock activity,the earthquake trend,the characteristics of damage are analyzed and discussed.This earthquake belongs to a sequence of earthquake swarm type and is of the concentratedly occurring characteristics of several main shocks in a time sequence,and the aftershock activity was normally attenuated.Because of the unreasonable design of buildings and repeated vibration by several destructive main shocks within a short period,the damage in the high intensity region was aggravated.The analysis and the prediction procedure of the 1991 Datong-Yanggao earthquake(Ms=5.8)are also briefly given. 相似文献
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Ran Hong-liu 《地震科学（英文版）》2004,17(6):671-677
In recent years, some researchers have studied the paleoearthquake along the Haiyuan fault and revealed a lot of paleoearthquake events. All available information allows more reliable analysis of earthquake recurrence interval and earthquake rupture patterns along the Haiyuan fault. Based on this paleoseismological information, the recurrence probability and magnitude distribution for M≥6.7 earthquakes in future 100 years along the Haiyuan fault can be obtained through weighted computation by using Poisson and Brownian passage time models and considering different rupture patterns. The result shows that the recurrence probability of M S≥6.7 earthquakes is about 0.035 in future 100 years along the Haiyuan fault. 相似文献
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HUANG Zhibin 《中国地震研究》2020,34(2):219-226
This paper summarizes the different stages of the development of earthquake automatic quick report in China. In early stage, scientists and technicians mainly focused on the realization of automatic identification of seismic phases and automatic positioning in the network data processing system. Then, at the end of the Tenth "Five-Year Plan" project, Fujian Earthquake Agency, Guangdong Earthquake Agency, and China Earthquake Networks Center have independently developed their earthquake automatic quick report systems. Later, by taking advantage of the "multi-channel comprehensive trigger" mechanism, China Earthquake Networks Center has innovated a comprehensive trigger system for automatic earthquake quick report, whereby earthquake information can be instantly reported and presented on Weibo, Wechat, and CENC App. 相似文献
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《中国地震研究》1994,(2)
Based on the analysis of the three current seismic intensity scales,the authors maintain that there are still some shortcomings in the present seismic intensity evaluation and propose a method which takes the damage rate of structures such as houses to determine the seismic intensity.Also,it is pointed out that the proposed method is favorable to the combination of seismic investigation,seismic damage forecast and hazard reduction counter-measures. 相似文献
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According to BGO data, it is discovered that ionospheric Alfvén resonances (IARs) observed as geomagnetic pulsations at frequencies of a few hertz arise in response to seismic events. The paper presents examples showing how seismic waves affect the IAR regime. Possible mechanisms of this effect are discussed. 相似文献