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Review on Deep Geophysical Exploration and Research in China

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Earthquake Research in China 2002年第3期16卷 283-292页

作者： Wang ChunyongInstitute of Geophysics, China Seismological Bureau, Beijing 100081, China Institute of Geophysics China Seismological Bureau Beijing 100081 China

The status of deep geophysical exploration and research in China is summarized in this paper. New achievements in the study of the velocity structure, seismotectonics and geodynamics of the crust and upper mantle are ... 详细信息

关键词： Deep geophysical exploration Velocity structure seismotectonics Geodynamics Crust and mantle

The Seismicity and Seismological Work of Myanmar

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Earthquake Research in China 2002年第3期16卷 228-235页

作者： Soe Win Aye Ko Department of Meteorology and Hydrology Department of Meteorology and Hydrology Mayangon 11061 Kabaaye Pagoda Road Yangon MyanmarMayangon 11061 Kabaaye Pagoda Road Yangon Myanmar

In this report, the set up, responsibility and objectives of the seismological division of Myanmar are briefly presented. A general description of the seismotectonics and seismicity in Myanmar is given. The activities... 详细信息

关键词： Myanmar seismotectonics Earthquake monitoring International cooperation

Seismotectonic Model for 1966 Xingtai Earthquake Swarm—— Nucleation of Newly Generated Fault or Friction Stick-slip Along a Preexisting Active Fault

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Earthquake Research in China 2001年第2期15卷 174-189页

作者： XuXiwei GuMengling 等 InstituteofGeology ChinaSeismologicalBureauBeijing100029China ResearchCenterofGeophysicalExploration CSBZhengzhou450003China

Shallow seismic profiling in meizoseismal area of Xingtai earthquakes, phase division of Cenozoic movement of deep and shallow structures, analysis of characteristics of crustal and upper mantle structure, and comparative study on parameters of seismic sources indicate that the listric faults controlling the development of early Tertiary basin-range structure and eastward gently-dipping detachment below it in the Xingtai epicentral area are not related to the occurrence of Xingtai earthquakes. The Xingtai earthquake swarm is a product of three-dimensional fracture process in which the discontinuous "deep faults", separated by NW-trending faults or by transverse barriers, successively tore, fractured, and propagated upward and, hence, caused the stress between the adjacent deep faults to migrate and load under the action of latest tectonic stress field. The Xingtai seismogenic fault represents a " newly generated fault" resulted from the upward tearing and propagation of the preexisting crustal " deep fault".

关键词： Xingtai earthquake Newly generated fault Preexisting active fault seismotectonics

First Determination of Source Parameters of Moderate Earthquakes (4.1 ≤ M ≤ 5.1) in Morocco from Spectral Analysis

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Open Journal of Earthquake Research 2014年第2期3卷 55-65页

作者： Ihsane Bensaid Lahcen Bahi Fida Medina Université Mohammed V-Agdal Ecole Mohammedia d’Ingénieurs Rabat Morocco Université Mohammed V-Agdal Institut Scientifique Laboratoire de Géologie et Télédétection (URAC 46) Equipe Télédétection Risques et Ressources Naturelles Rabat Morocco Université Mohammed V-Agdal Institut Scientifique Laboratoire de Physique du Globe Equipe Géophysique de Subsurface Rabat Morocco Université Mohammed V-Agdal Ecole Mohammedia d’Ingénieurs Rabat Morocco

Recent installation of an array of broad band seismological stations in Morocco allowed us to study the records of five recent (2005-2008) moderate earthquakes (4.1 ≤ M ≤ 5.1) in order to determine their source parameters (seismic moment, fault slip, rupture area and stress drop) from P-wave spectra. We also studied the older Rissani events of 1992 using teleseismic data. Values of Mo, r, Δu and Δσ are, respectively, 1.1 × 1013 - 6 × 1016 Nm;0.50 - 3.9 km;0.8 - 5.8 cm and 0.3 - 1.49 MPa. The results are in accordance with the seismotectonic and geodynamic setting of Morocco as, for instance, the amount of slip along the faults with respect to the relative displacement of Nubia to Iberia (~4 mm·yr-1) determined from GPS data, taking into account the period of stress accumulation. However, some events show very variable corner frequency and low-frequency amplitude values which lead to considerably higher stress drop and fault slip values, especially at the nearest stations, which may reflect some site effects or uncertainties on depth and take-off angles.

关键词： Morocco Seismicity Fault-Plane Solutions P-Wave Spectra Source Parameters seismotectonics

Possible Location of the Next Major Earthquakes in the Northern Apennines: Present Key Role of the Romagna-Marche-Umbria Wedge

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International Journal of Geosciences 2017年第11期8卷 1301-1314页

作者： Enzo Mantovani Marcello Viti Daniele Babbucci Caterina Tamburelli Nicola Cenni Dipartimento di Scienze Fisiche della Terra e dell’Ambiente Università degli Studi di Siena Siena Italy Dipartimento di Fisica e Astronomia Università degli Studi di Bologna Bologna Italy Dipartimento di Ingegneria Civile Chimica Ambientale e Meccanica Università degli Studi di Bologna Bologna Italy Abstract

It is argued that in some zones of the Northern Apennines, in particular the Rimini-Ancona thrust system, the Romagna Apennines and the Alta Valtiberina trough, the probability of major earthquakes is now higher than in other Apennine zones. This hypothesis is suggested by the comparison of the present short-term kinematics of the Romagna-Marche-Umbria wedge in the Northern Apennines, deduced by the distribution of major shocks in the last tens of years, with the previous repeated behavior of the same wedge, evidenced by the distribution of major earthquakes in the last seven centuries. The seismotectonics of the Apennine region here considered is closely connected with the larger context that involves the progressive migration (from south to north) of seismicity along the peri-Adriatic zones. The information provided by this study can be used to better manage the resources for prevention in Italy.

关键词： Peri-Adriatic Seismicity Northern Apennines Romagna-Marche-Umbria seismotectonics

Belt-Parallel Shortening in the Northern Apennines and Seismotectonic Implications

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International Journal of Geosciences 2015年第8期6卷 938-961页

作者： Marcello Viti Enzo Mantovani Daniele Babbucci Caterina Tamburelli Nicola Cenni Massimo Baglione Vittorio D’Intinosante Dipartimento di Scienze Fisiche della Terra e dell’Ambiente Università degli Studi di Siena Siena Italy Dipartimento di Fisica ed Astronomia Università degli Studi di Bologna Bologna Italy Settore Sismica Regione Toscana Firenze Italy

Major seismic activity in the Northern Apennines concentrates in few zones, distributed in a peculiar way. It is argued that such context may be plausibly explained as an effect of belt-parallel?shortening, which has caused oroclinal bending of the longitudinal ridges formed during the Late Miocene to Lower Pliocene evolutionary phase. The main effects of this process, developed since the upper Pliocene, have mainly affected the outer sectors of the belt. The major seismic sources have generated in the zones where different oroclinal bendings of adjacent ridges have produced extensional/transtensional deformation. In the inner side of the Northern Apennines, belt parallel shortening has occurred at a lower rate. The main effects have resulted from the shortening of the?Albano-Chianti-Rapolano-Cetona ridge. In particular, the proposed tectonic setting may account?for the moderate seismic activity that occurs in the Firenze, Elsa, Pesa, Siena and Radicofani basins.

关键词： Northern Apennines seismotectonics Oroclinal Bending

The South-Western Alboran Earthquake Sequence of January-March 2016 and Its Associated Coulomb Stress Changes

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Open Journal of Earthquake Research 2017年第1期6卷 35-54页

作者： Fida Medina Taj-Eddine Cherkaoui Moroccan Association of Geosciences Rabat Morocco Mohammed V University in Rabat Rabat Morocco

We expose the results of the study of the south-western Alboran seismic sequence of January-March 2016 and the stress perturbations it caused by means of Coulomb modeling. The use of data from numerous stations allowed us to relocate the largest events (Mw ≥ 3.8) south of those determined by IGN (Spain). The main shock of 25 January 2016 (Mw = 6.3) was relocated at 35.6133°N × 3.6888°W, at a hypocentral depth of 15.5 ± 6.0 km. The epicenters are aligned along two distinct clusters: The first runs N-S towards the Moroccan coast along Al-Idrissi fracture zone, while the second is centered on the Alboran ridge northern thrust fault. The focal mechanisms determined by different agencies correspond to a strike-slip/normal/reverse motion in the western cluster and thrusting in the eastern one. Coulomb stress change modeling shows that the main earthquake: (1) may have been triggered by stress accumulation by the 1994 and 2004 earthquakes;(2) has induced stress perturbations that provide a suitable explanation for the distribution of the aftershock clusters, including the eastern cluster. The prediction of the next event shows that it is likely to occur near the Moroccan coast.

关键词： Morocco Seismicity Alboran Al Hoceima Coulomb Stress Change seismotectonics Seismic Hazard

Eastern Kunlun Active Fault Zone and Its Seismic Activity

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Earthquake Research in China 1996年第4期10卷 46-55页

作者： Liu GuangxunInstitute of Crustal Dynamics,SSB,Beijing,100085,China

In addition to a brief description of the tectonic background and evolutionary history of the Eastern Kunlun active fault zone,this paper emphatically describes the spatial distribution,geometry,Quaternary movement,and strong earthquake activities of this fault *** fault zone is characterized by a long evolutionary history,deep seated tectonic background,and intense Quaternary,even Holocene,*** played an important role in the tectonic evolution of China,especially in the uplifting and formation of the Qinghai-Xizang *** is also a major pleistoseismic belt in western *** on modern strong earthquake records as well as the newly discovered evidence of multiple Holocene paleoearthquakes and their surface rupture zones along the entire fault zone,the spatial and temporal distribution pattern of strong earthquakes along the fauit zone is ***,the macroscopic epicenter location of the 1937 Huashixia earthquake with M=7.5 and the distribution and scope of its surface

关键词： Tibet Plateau Active fault seismotectonics Seismic activity Paleo-earthquake

Present Tectonic Setting and Spatio-Temporal Distribution of Seismicity in the Apennine Belt

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International Journal of Geosciences 2015年第4期6卷 429-454页

作者： Enzo Mantovani Marcello Viti Daniele Babbucci Caterina Tamburelli Nicola Cenni Massimo Baglione Vittorio D’Intinosante Dipartimento di Scienze Fisiche della Terra e dell’Ambiente Università degli Studi di Siena Siena Italy Dipartimento di Scienze Biologiche Geologiche e Ambientali Università degli Studi di Bologna Bologna Italy Settore Sismica Regione Toscana Firenze Italy

In previous papers, we have argued that a close connection may exist between the discontinuous northward displacement of the Adria plate and the spatio-temporal distribution of major earthquakes in the?periAdriatic?regions?[1]-[3]. In particular, five seismic sequences are tentatively recognized in the post 1400 A.D. seismic history, each characterized by a progressive migration of major shocks along the eastern (Hellenides, Dinarides), western (Apennines) and northern (Eastern Southern Alps) boundaries of Adria. In this work, we describe an attempt at gaining insights into the short-term evolution of the strain field that underlies the migration of seismicity in the Apennine belt. The results of this study suggest that seismicity in the study area is mainly conditioned by the fact that the outer (Adriatic) sector of the Apennine belt, driven by the Adria plate, is moving faster than the inner (Tyrrhenian) belt. This kinematics is consistent with the observed Pleistocene deformation pattern and the velocity field inferred by GPS data. The spatio-temporal distribution of major shocks during the last still ongoing seismic sequence (post 1930) suggests that at present the probability of next major shocks is highest in the Northern Apennines. Within this area, we suggest that seismic hazard is higher in the zones located around the outer sector of the Romagna-Marche-Umbria units (RMU), since that wedge is undergoing an accelerated relative motion with respect to the inner Apennine belt. This hypothesis may also account for the pattern of background seismicity in the Northern Apennines. This last activity might indicate that the Upper Tiber Valley fault system is the most resisted boundary sector of the RMU mobile wedge, implying an higher probability of major earthquakes.

关键词： seismotectonics Seismic Hazard GPS Apennines Mediterranean