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Characteristics of fault rocks and paleo-earthquake source along the Koktokay-Ertai fault zone,Xinjiang,China

Acta Seismologica Sinica(English Edition) 1997年第3期10卷 77-85页

作者：史兰斌林传勇陈孝德张小鸥柏美祥 1. Institute of Geology State seismological Bureau 100029 Beijing China 2. Seismological Bureau of Xinjiang Uygur Autonomous Region ür ümqi 830011 China

The Koktokay Ertai fault zone was developed on the basis of a former ductile shear zone (mylonite zone). The mylonites were formed in the brittle ductile transition zone at 10～15 km depth within the crust. The rocks had experienced multi period deformation processes, including ductile deformation, ductile instability and brittle seismic faulting which had gave rise to the formation of Koktokay Ertai fault zone and the development of pseudotachylytes. The pseudotachylytes are distributed within an area about 60 km in length and 300 m in width, which may represent the scale of the paleo earthquake source. The physical conditions of the paleo earthquake source was similar to those for the formation of the mylonites along this zone.

关键词： fault rocks ductile shearing paleo earthquake source ductile instability

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earthquake source, Path and Site Effects

Earthquake Source, Path and Site Effects

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第四届世界华人地质科学研讨会

作者： Shengzao Chen Geomatrix Consultants Inc. 2101 Webster St 12th FL Oakland CA94612 USA

＜正＞source radiation, path anelastic scattering, and she responses constitute a major component of ground motion seismology. Observed spectra generally reflect the combined effects of the source nucleation, along with whole-path and local attenuation and amplification. To separate source spectra from path and site responses, both of these effects must be removed from Fourier spectra computed from strong motion records. For this purpose, effects of geometrical spreading, anelastic scattering （whole-path） attenuation （1/Q）, and site effects have been extensively studied over different tectonic regions around the world. Attenuation effects include geometric spreading, anelastic attenuation, and near-surface attenuation. There are also crustal amplification effects, which can be significant where mere exists a strong velocity contrast or gradient Among the tectonic regions studied, it is found that source spectra are approximately independent of region, distance, and depth when path and site effects are properly removed Kappa values vary regionally. The lowest kappa value corresponds to the hard rock sites in a stable intraplate environment （for example, eastern North America）, while generally higher kappa values correspond to the site conditions in active tectonic environments such as Japan, Mexico, British Columbia （western Canada）, California, and Turkey.

关键词： strong ground motion earthquake source seismic-wave propagation attenuation crustal structure focal depth.

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Rupture behavior of the 2017 M_(W)6.6 Poso earthquake in Sulawesi,Indonesia

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Geodesy and Geodynamics 2021年第5期12卷 329-335页

作者： Dimas Sianipar Gatut Daniarsyad P.Priyobudi Nova Heryandoko D.Daryono Badan Meteorologi Klimatologidan Geofisika(BMKG)Jakarta10610Indonesia Sekolah Tinggi Meteorologi Klimatologidan Geofisika(STMKG)Tangerang Selatan15221Indonesia

On May 29, 2017, the MW6.6 Poso earthquake occurred in Central Sulawesi, Indonesia, causing moderate damages. The mainshock rupture and primary aftershock cluster occurred in the active Palolo-Sausu tectonic zone, and some aftershocks also took place around the Tokararu fault. However, the rupture mechanism of this earthquake and its relation to regional tectonics are not clear. In this study, the rupture process of the Poso mainshock is estimated by finite-fault waveform inversion, which is constrained by teleseismic bodies and surface waves. The rupture propagates upward unilaterally in a southwest-dipping moderate-angle(~34°) normal fault beneath Tokorondo Mountains, with a notable~15% initial moment release at the first 4 s of the ~12 s rupture duration. The average and peak slip are0.5 m and 1.5 m, respectively. The rupture velocity is relatively slow(less than 2.5 km/s), and the Coulomb stress changes due to the mainshock are obtained using the inverted coseismic slip.

关键词： Finite-fault Rupture process earthquake source Seismogram

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Active Tectonics in Tuscany (Central Italy): Ten Years of Seismicity (2009-2019)

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International Journal of Geosciences 2020年第10期11卷 613-650页

作者： Marcello Viti Dipartimento di Scienze Fisiche della Terra e dell’Ambiente Università degli Studi di Siena Siena Italy

Strong earthquakes (moment magnitude MW ≥ 5.5) are uncommon in Tuscany and surroundings (central Italy). The last strong seismic event occurred a century ago (September 7, 1920 Garfagnana, MW = 6.53). The paucity of seismic instrumental recordings hinders the identification of the tectonic regime active in Tuscany. On the other hand, the geological and geomorphological pieces of evidence collected so far, concerning potential active and capable faults, are scarce, fragmentary and ambiguous. In this work I shed light on the active deformation of Tuscany by using two independent approaches: earthquake source mechanisms and GNSS (GPS) geodetic measurements. I have considered 41 small seismic events (MW ≤ 5.1) that occurred in the study area during the last decade. The related source mechanisms (retrieved by the Time Domain Moment Tensor method) define a relatively clear picture of the active deformation: extension along the northern Apennine watershed and strike-slip regime within inner Tuscany, up to the Tyrrhenian coast. This pattern broadly agrees with the horizontal strain field reconstructed by the geodetic velocity field. The latter has been constrained by a network of 840 GPS stations located in Italy and neighboring countries, operating in the last 20 years.

关键词： Seismotectonics earthquake source Active Faulting Satellite Geodesy Northern Apennines Italian Region

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