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Earthquake deformation observed in Beijing and the analysis with the seismic effect


After the earthquake occurred in China another huge earthquake. The 1 month after the earthquake, the aftershocks, the largest aftershock to May 26, 2008 6.4 magnitude earthquake occurred. The occurrence of the earthquake in China no doubt a period of strong earthquakes in the future have a profound impact. Some studies suggest that the same is to reveal the crustal seismic effect of medium on the stress-strain response is the most direct and most effective means of, and co-seismic deformation observation is undoubtedly the most direct means of response. For further study of the earthquake on the earthquake in Beijing trends of the future, the systematic collection and collation of the Beijing area of digital deformation observation data recorded scores of co-seismic effects of information, analysis of the earthquake after the earthquake with the seismic change and the effects of characteristics. In general, the same shock effect is strong after the earthquake, when seismic waves to spread the Through the Wenchuan earthquake, in Beijing deformation instruments are recorded when significant seismic deformation waves, the main features are: (1) various types of equipment to record the same stage when the initial to basically the same,[link widoczny dla zalogowanych], but there are individual differences. (2) 7min volume strain recorded after the earthquake when the seismic deformation waves,[link widoczny dla zalogowanych], 12 ~ 15min after the most significant (North 200 units, two business units, Paradise Creek Taiwan, Chang platform); water tiltmeter 4min after the earthquake recorded when the earthquake deformation waves, 10min after the most significant (Yanqing sets); cave 4rain strain recorded after the earthquake when the seismic deformation waves, 10rain there about the most significant (Yanqing sets); horizontal pendulum tilt recorded 3min after the earthquake when the earthquake deformation waves,[link widoczny dla zalogowanych], 9min there about the most significant (Yanqing sets); borehole strain recorded 4min after the earthquake, when seismic deformation waves, 9 ~ 12min or so of the highest amplitude (appeasement of the village, the village after Maoshan Pinggu, Shunyi Longwan Tuen Taiwan ); cross-faults in 5 ~ 7min after the earthquake, recorded when the earthquake deformation waves, 9min there about the most significant (large gray plant, cattle valley mouth.) (3) the magnitude of various instruments and similar instruments waveform records in different directions on the difference between the larger amplitude waveform record,[link widoczny dla zalogowanych], the largest recorded earthquake with magnitude of deformation may be related to instrument performance, parameters, site response related, are not suitable for horizontal comparison. (4) similar instrument deformation waves when the earthquake began to decay roughly the same time, in about 4 ~ 5h after the earthquake, there are l ~ 2h basically complete attenuation. (5) various types of equipment when the earthquake wave recorded step change, but the profiles are different, there is the step, the next step, basically the same three types. Similar differences are also more directional instruments, which may reflect the local stress field in the Beijing area changes and differences in structural characteristics. (6) as the sampling rate of digital instruments 1 / min, time measurements can only be accurate to sub-theory,[link widoczny dla zalogowanych], therefore, recorded the process inevitably miss a lot of information. (7) of the objective record of coseismic effect, indicating the accuracy of these instruments have to meet the design requirements. Due to the current digital deformation observations can not fully reveal some information related with the earthquake, and so the response with the seismic deformation rate, duration and other characteristics of the earthquake magnitude and epicentral distance to determine the relationship between the difficult to establish, but the most significant co-seismic deformation or the maximum duration and magnitude and epicentral distance may exist between some of the dependencies, which for the analysis of the characteristics of impending earthquake precursors and precursor according to impending earthquake prediction research has a certain significance; in the digital deformation observation, we found that different to the recorded The most significant deformation and step wave is very different, after analysis, may be related to the compressive stress of the earthquake to the northeast, but also may be subject to anisotropy, station location, equipment orientation, regional fault structure, making the stress or strain response is inconsistent; digital deformation observations although the earthquake have some when the earthquake and the earthquake reflects, but their are still some deficiencies, such as individual digital observation equipment on the same seismic response records appeared missing and out cell phenomenon, therefore, precursors of seismic deformation data also need long-term accumulation and the continuous efforts of researchers to explore. On-mail:-wu-anxu @ -163. com national research projects (2006BAC01B03_02-o3; 03-04-04) and Joint Seismological Science Foundation (A07058) funding. l17
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