共查询到20条相似文献，搜索用时 187 毫秒
1.
Study of crustal seismic velocity in the Weihe fault depression basin by seismic tomographic imaging
ＳｔｕｄｙｏｆｃｒｕｓｔａｌｓｅｉｓｍｉｃｖｅｌｏｃｉｔｙｉｎｔｈｅＷｅｉｈｅｆａｕｌｔｄｅｐｒｅｓｉｏｎｂａｓｉｎｂｙｓｅｉｓｍｉｃｔｏｍｏｇｒａｐｈｉｃｉｍａｇｉｎｇＧＵＡＮＧＹＩＮＧＸＵＥ１）（薛广盈）ＹＵＮＹＵＤＩＮＧ２）（丁韫玉）ＺＨ... 相似文献
2.
ＳｅｉｓｍｉｃａｃｔｉｖｉｔｙａｎｄａｃｔｉｖｅｆａｕｌｔｓｉｎＨｕａｉｌａｉｂａｓｉｎＰＥＩＤＥＷＡＮＧ（王培德）ＹＵＨＯＮＧＴＩＡＮ（田玉红）ＣＨＵＮＬＡＩＬＩ（李春来）ＹＵＮＴＡＩＣＨＥＮ（陈运泰）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓ... 相似文献
3.
ＳｔｕｄｙｏｆｔｈｅａｎｏｍａｌｙｏｆｓｅｉｓｍｉｃｆｒａｃｔａｌｓｐｅｃｔｒｕｍｂｅｆｏｒｅｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅｓＬＩＮＧＲＥＮＺＨＵ１）（朱令人）ＳＨＩＹＯＮＧＺＨＯＵ１）（周仕勇）ＭＡＬＩＮＧＹＡＮＧ１）（杨马陵）ＨＡＩＴ... 相似文献
4.
ＳｅｉｓｍｉｃｗａｖｅｐｒｏｐａｇａｔｉｏｎｉｎｖｉｓｃｏｅｌａｓｔｉｃａｎｄｓａｔｕｒａｔｅｄｒｏｃｋＹＵＡＮＱＩＡＮＧＣＡＩ（蔡袁强）ＣＨＡＮＧＪＩＥＸＵ（徐长节）ＳＨＩＭＩＮＧＷＵ（吴世明）ＤｅｐａｒｔｍｅｎｔｏｆＣｉｖｉｌＥｎｇｉｎｅ... 相似文献
5.
Ｓｔｕｄｙｏｆａ３ＤｓｅｉｓｍｉｃｇａｐＹＵＡＮＱＩＮＧＺＨＵ１）（朱元清）ＣＯＮＧＪＵＮＸＩＡ１）（夏从俊）ＧＥＴＵＺＵＯＬＩ２）（左力格图）ＨＵＩＭＩＮＬＩ１）（李慧民）１）ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＳｈａｎｇｈａｉ，... 相似文献
6.
ＳｏｍｅｒｅｓｕｌｔｓｏｆｍｏｄｅｌｉｎｇＤＤｓｅｉｓｍｏｇｅｎｉｃｐａｔｅｒｎｂｙｔｈｅｆｒａｃｔｕｒｅｍｏｄｅｌｅｘｐｅｒｉｍｅｎｔｏｆｌａｒｇｅ－ｓｃａｌｅｒｏｃｋｓａｍｐｌｅｓ（Ｉ）ＹＡＮＧ－ＱＵＡＮＬＵ１）（陆阳泉）ＪＩＡ－ＬＩＵＺＨＡ... 相似文献
7.
Ｓｅｉｓｍｉｃｓｏｕｒｃｅｒｕｐｔｕｒｅｓｏｆｓｅｖｅｒａｌｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅｓｏｆ１９８９ｉｎＳｉｃｈｕａｎｒｅｇｉｏｎｏｆＣｈｉｎａＹＵＡＮＧＡＯ１）（高原）ＺＨＯＮＧ－ＬＩＡＮＧＷＵ２）（吴忠良）ＨＵＩ－ＬＡＮＺＨＯＵ３）（周... 相似文献
8.
ＴｈｅｉｄｅｎｔｉｆｉｃａｔｉｏｎａｎｄｃｒｉｔｅｒｉａｏｆｓｈｏｒｔｔｅｒｍｓｅｉｓｍｉｃｉｔｙｇａｐｂｅｆｏｒｅａｇｒｅａｔｅａｒｔｈｑｕａｋｅＪＩＮＧＱＵＡＮＣＡＯ（曹井泉）ＪＩＡＬＩＮＳＵＮ（孙加林）ＹＩＹＡＮＧ（杨毅）Ｓｅｉｓｍｏｌ... 相似文献
9.
scattering and refracting of plane strain wave by a cylindrical inclusion in fluidsaturated soils 总被引：1，自引：0，他引：1
ＳｃａｔｅｒｉｎｇａｎｄｒｅｆｒａｃｔｉｎｇｏｆｐｌａｎｅｓｔｒａｉｎｗａｖｅｂｙａｃｙｌｉｎｄｒｉｃａｌｉｎｃｌｕｓｉｏｎｉｎｆｌｕｉｄｓａｔｕｒａｔｅｄｓｏｉｌｓＹＡＹＵＡＮＨＵ（胡亚元）ＬＩＺＨＯＮＧＷＡＮＧ（王立忠）ＹＵＮＭＩＮＣＨ... 相似文献
10.
ＩｎｄｉｒｅｃｔａｐｐｒｏａｃｈｍｅｔｈｏｄｆｏｒｓｐｅｃｉｆｉｅｄｅｎｄｐｏｉｎｔｓｓｅｉｓｍｉｃｒａｙｔｒａｃｉｎｇｉｎｔｈｒｅｄｉｍｅｎｓｉｏｎａｌｉｎｈｏｍｏｇｅｎｅｏｕｓｍｅｄｉａＣＨＡＯＦＡＮＸＵ（徐朝繁）ＸＩＡＮＫＡＮＧＺＨ... 相似文献
11.
ＳｔｕｄｙｏｆｃａｌｉｂｒａｔｉｏｎｆｕｎｃｔｉｏｎｆｏｒｓｕｒｆａｃｅｗａｖｅｍａｇｎｉｔｕｄｅｏｆＤＫ１ｓｅｉｓｍｏｇｒａｐｈｓＦＥＮＧＸＵＥ（薛峰）ＹＯＮＧＺＨＡＯ（赵永）ＣｅｎｔｅｒｆｏｒＡｎａｌｙｓｉｓａｎｄＰｒｅｄｉｃｔｉｏｎ，Ｓｔａｔ... 相似文献
12.
Summary TheM
s
Rayleigh wave magnitude formula is revised for purposes of eliminating the variable effects of near distances and propagation pats on the values computed from standard long period seismograms. The improved formulation employs a revised distance correction function and period dependent path correction that normalisesM
s
to large teleseismic distance, 20 second values. The method for computing the path corrections is described. The magnitude scale presented here givesM
s
values which are within ±0.1 magnitude units of the Gutenberg and Prague magnitude formulae. 相似文献
13.
We derive S-wave attenuation characteristics, earthquake source parameters and site amplification functions at seismic stations
used for earthquake early warning in the Irpinia–Basilicata region, using non-parametric spectral inversion of seismograms
from 49 local events with M
L = 1.5–3.1. We obtain relatively low Q values (Q
0 = 28 at a frequency of 1 Hz) in conjunction with a strong frequency-dependence (close to linear). The source spectra can
be satisfactorily modeled using the omega-square model, with stress drops ranging between 0.01–2 MPa, and in the narrow magnitude
range available for analysis, the source spectra seem to scale self-similarly. The local magnitude M
L shows a linear correlation with moment magnitude M
W, however with a systematic underestimation by about 0.5-magnitude units. The results obtained in this work provide important
insights into the ground-motion characteristics that are required for appropriate seismic hazard assessment and are of practical
relevance for a suite of applications, such as the calibration of ground-motion prediction equations or the correction for
site amplification in earthquake early warning and rapid calculation of shake-maps for seismic emergency management. 相似文献
14.
On 22 September 2002, the largest UK earthquake (mb4.3) of the last 10 years occurred near the town of Dudley in the West Midlands. Here we determine the earthquake focal mechanism and depth using data from stations at regional and teleseismic distances. Short-period teleseismic seismograms are interpreted in terms of P and surface reflections pP and sP. This analysis suggests that the source depth is deeper than the 9.7 km initially determined by the British Geological Survey (BGS). The relative amplitude method is applied to four teleseismic seismograms to support our interpretation of the surface reflections, and constrain the focal mechanism. Our preferred focal mechanism, a near vertical strike-slip with s = 94°, = 88° and = –179°, is in reasonable agreement with a moment tensor determined by the Swiss Seismological Service. Synthetic regional surface wave seismograms match the observed seismograms for a model focal depth of 19.5 (±3.0) km and scalar moment, M0, of 3.2 × 1015 N m. Our results emphasize that due to the well-known trade-off between depth and M0 from inversions of long period (0.02–0.1 Hz) surface waves, it is preferable to combine long- and short-period data to constrain reliably the depth and hence estimate M0. Our focal mechanism and depth are further validated by generating short-period synthetic seismograms that match the observations. 相似文献
15.
We conducted moment tensor inversion and studied source rupture process for M
S=7.9 earthquake occurred in the border area of China, Russia and Mongolia on September 27 2003, by using digital teleseismic
P-wave seismograms recorded by long-period seismograph stations of the global seismic network. Considering the aftershock
distribution and the tectonic settings around the epicentral area, we propose that the M
S=7.9 earthquake occurred on a fault plane with the strike of 127°, the dip of 79° and the rake of 171°. The rupture process
inversion result of M
S=7.9 earthquake shows that the total rupture duration is about 37 s, the scalar moment tensor is M
0=0.97×1020 N·m. Rupture mainly occurred on the shallow area with 110 km long and 30 km wide, the location in which the rupture initiated
is not where the main rupture took place, and the area with slip greater than 0.5 m basically lies within 35 km deep middle-crust
under the earth surface. The maximum static slip is 3.6 m. There are two distinct areas with slip larger than 2.0 m. We noticed
that when the rupture propagated towards northwest and closed to the area around the M
S=7.3 hypocenter, the slip decreased rapidly, which may indicate that the rupture process was stopped by barriers. The consistence
of spatial distribution of slip on the fault plane with the distribution of aftershocks also supports that the rupture is
a heterogeneous process owing to the presence of barriers. 相似文献
16.
Global epicentre maps show that the majority of earthquakes are inter-plate, although moderate to large earthquakes do occur intra-plate, i.e. within the plates. The seismicity of the Australian continent is typical of intra-plate environments and a magnitude ML 6 earthquake has an average return period of about 5 years. Recordings of Australian intra-plate earthquakes are investigated here to characterise their frequency content, peak acceleration and duration.Due to lack of quality strong motion records of large intra-plate earthquakes at short distances, synthetic seismograms are commonly used for testing structural behaviour. An empirical Green's Function method (Geophys. Res. Lett., 5 (1978), 1–4; Proceedings of the Third International Microzonation Conference, Seattle, USA, vol. 1, (1982), pp. 447–458.) is chosen to simulate a large earthquake by summation in time of a number of smaller earthquakes or sub-events, each given a slightly different origin time to represent more realistically the propagation of a rupture along an assumed fault plane. In the first instance, recordings on rock of the magnitude ML 2.3 aftershock of the 29 December 1989 Newcastle earthquake were used as sub-events to simulate the main shock of magnitude ML 5.6. Validation studies for events recorded elsewhere in Australia are also considered.The response spectra of such synthetic events will be compared with the recommended spectra developed empirically from a statistical analysis of strong motion data for magnitude 5.4–6.5 intra-plate earthquakes recorded in other parts of the world and normalised to a peak ground velocity of 50 mm/s which is typical for a return period of 500 years in Australia (Australasian Structural Engineering Conference, Auckland, New Zealand, (1998), pp. 439–444.). Preliminary results from this comparison with the response spectra recommended for the Building Code of Australia show that the synthetic waveforms produced by this method are realistic and can be used to represent ground motion during typical Australian intra-plate earthquakes. 相似文献
17.
We present an efficient scheme to compute high-frequency seismograms (up to 10 Hz) forSH-waves in a horizontally stratified medium with the mode summation method. The formalism which permits the computation of eigenvalues, eigenfunctions and related integral quantities is discussed in detail. Anelasticity is included in the model by using the variational method. Phase velocity, group velocity, energy integral and attenuation spectra of a structure enable the computation of complete strong motion seismograms, which are the basic tool for the interpretation of near-source broad-band data.Different examples computed for continental structures are discussed, where one example is the comparison between the observed transversal displacement recorded at station IVC for the November 4, Brawley 1976 earthquake and synthetic signals. In the case of a magnitudeM
L
=5.7 earthquake in the Friuli seismic area we apply the mode summation method to infer from waveform modeling of all three components of motion of observed data some characteristics of the source.On leave from Institute of Geophysics, ETH, Zürich, Switzerland. 相似文献
18.
2021年5月22日,青海省果洛州玛多县发生7.4级地震,中国强震动观测网络在主震中捕获16组强震动数据。对48条三分向加速度记录进行基线校正、滤波等常规处理,计算相应的地震动参数,发现位于断层破裂前向位置的63DAW台NS向记录的地震动速度波形具有长周期分量丰富的特征。分析6个典型台站的单自由度加速度反应谱,并与我国建筑抗震设计谱比较,分析此次地震的频谱特性。将实际观测到的PGA、PGV和S_a(T=0.1 s、T=1.0 s、T=2.0 s、T=5.0 s)与国内广泛使用的几种地震动预测模型对比,研究此次地震的影响场。通过分析S_a-S_d曲线,探讨此次地震靠近断层区域地面运动大位移与桥梁落梁震害间可能存在的关系。 相似文献
19.
A formula to determine the local magnitude (ML) following Richters original definition was empirically derived for the Korean Peninsula. A total of 1,644 digital seismograms from 142 Korean earthquakes that occurred from 1997 to 2000 were corrected for instrument response and convolved with the nominal Wood-Anderson torsion seismograph response to be appropriate for the original definition of ML. Then, the zero-to-peak amplitude was measured in millimeters on the synthetic Wood-Anderson seismogram. Multiple regression analysis was conducted to determine distance and station correction terms for the measured peak amplitudes. The best-fit solution for ML yielded the following formula for the Korean Peninsula:where A() and S denote the peak amplitude on the synthetic Wood-Anderson seismogram at distance and the station correction term, respectively. Note that the second term, distance correction, was adjusted with Richters ML, taking into consideration attenuation differences between the Korean Peninsula and southern California, where Richter originally introduced ML. On average, the magnitudes determined in this study are nearly the same as those determined by the Korea Institute of Geoscience and Mineral Resources (KIGAM), but are larger than those of the Korea Meteorological Administration (KMA) by as much as 0.36. 相似文献
20.
Observations and studies of electromagnetic waves during the approaching of earthquakes 总被引：1，自引：0，他引：1
This article introduces the practical observation results of pre-earthquake electromagnetic radiations at the network of monitoring
stations in Jiangsu region in resent years and discusses the electromagnetic wave precursors during the approaching period
of earthquakes based on the observations of the electromagetic radiation signals before theM
s 6.0 Liyang earthquake of 1979 in Jiangsu province, theM
s 5.9 Heze earthquake of 1983 in Shandong province and theM
s 6.2 South Yellow Sea earthquake of 1984. 相似文献