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Identification of hidden faults using determining velocity structure profile by spatial autocorrelation method in the west of Mashhad plain(Northeast of Iran)

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Journal of Mountain Science 2021年第12期18卷 3261-3274页

作者： Seyedeh Fatemeh NEMATI Naser HAFEZI MOGHADAS Gholam Reza LASHKARIPOUR Hosein SADEGHI Department of Geology Faculty of ScienceFerdowsi University of MashhadMashhad 91775-1436Iran

Characterizing the subsurface structure is an important parameter for the improvement of seismic hazard *** to the tectonic complexity of the earth,some deep fractures do not reach the earth's surface and are not detectable with visual ***,the lack of knowledge of faults and fractures can result in disasters,especially in urban *** geophysical methods can be used to estimate subsurface structure ***,a more reliable method is required to assess seismic hazards and reduce potential damage in metropolitan areas without destroying buildings and *** paper aims to identify hidden faults and structures using shear wave velocity *** do this,surface wave dispersion curve was extracted from the vertical component of microtremor array recording using the spatial autocorrelation(SPAC)method in two profiles and 13 array stations(perpendicular to the altitudes)to obtain shear wave velocity structure(Vs)in the west of Mashhad,northeast of *** results of shear wave velocity profiles(Vs)indicate sudden changes in the thickness of *** can be related to the displacement of a normal fault in this area causing the bottom rock to fall and an increase in the alluvial thickness in the central part of the *** velocity in the floor rock is 2000 meters per second in this *** to the surface outcrops and water wells data,its material is slate and Phyllite metamorphic rocks that are exposed in the adjacent ***,the seismic profile results were well consistent with electrical resistance data and well logs indicating that the tool array method is flexible,non-invasive,relatively fast,and effective for urban areas with satisfactory accuracy.

关键词： Subsurface Structure Hidden Fault array microtremor SPAC Method Vs Profile Mashhad Seismic hazard assessment

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Characteristics and application test of long period microtremor in China

Characteristics and application test of long period microtre...

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2014年中国地球科学联合学术年会——国际专题（2）Microseismic Monitoring and Inversion

作者： Shaokong Feng Ailan Che Lanmin Wang Zhijian Wu Hiroaki Yamanaka Shanghai Jiaotong Univ. Lanzhou Institute of Seismology China Earthquake Administration Tokyo Institute of Technology

As a simple, quick and inexpensive method for site characterization and deep geological survey, array microtremor survey as well as H/V observation is expected to play important roles in China’s earthquake disaster prevention program, especially in the vast, economically delayed inland area. We started a co-study program on the characteristics and applications of long period microtremor in China continent from 2008. We have made microtremor observations from the coast cities like Shanghai and Tianjin through Beijing, Xi’an, to the far inland cities Lanzhou and Tianshui over the continent using long period seismometers. We also carried out some field test of applications for structure survey. The observation shows that the level of power spectrum of long period microtremor in the coast area is the same as in Japan. From the coast to the inland area, the level reduced rapidly, but even in Tianshui, which is over 1500 kilometers from the coast, with careful observation, it is still possible to use for geological survey.

关键词： Long period microtremor array microtremor H/V observation Power spectrum Site characterization Earthquake engineering

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