Focal mechanism solutions and their tectonic implications for the eastern Alpine-Himalayan region

1981 ◽  
pp. 243-271 ◽  
Author(s):  
Umesh Chandra
Keyword(s):  
Focal Mechanism ◽  
Himalayan Region ◽  
Focal Mechanism Solutions ◽  
Tectonic Implications

Focal Mechanism Solutions of the 2003 Delingha, QinghaiM6.7 Earthquake Sequence and Their Tectonic Implications

2012 ◽  
Vol 55 (6) ◽  
pp. 680-688 ◽  
Author(s):  
Chang-Hong SUN ◽  
Feng XU ◽  
Yu-Bo YANG ◽  
Rong-Yi QIAN ◽  
Xiao-Hong MENG
Keyword(s):  
Focal Mechanism ◽  
Earthquake Sequence ◽  
Focal Mechanism Solutions ◽  
Tectonic Implications

scholarly journals Stress relaxation arrested the mainshock rupture of the 2016 Central Tottori earthquake

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Yoshihisa Iio ◽  
Satoshi Matsumoto ◽  
Yusuke Yamashita ◽  
Shin’ichi Sakai ◽  
Kazuhide Tomisaka ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Focal Mechanism ◽  
Large Earthquake ◽  
Static Stress ◽  
Focal Mechanism Solutions ◽  
Large Earthquakes

AbstractAfter a large earthquake, many small earthquakes, called aftershocks, ensue. Additional large earthquakes typically do not occur, despite the fact that the large static stress near the edges of the fault is expected to trigger further large earthquakes at these locations. Here we analyse ~10,000 highly accurate focal mechanism solutions of aftershocks of the 2016 Mw 6.2 Central Tottori earthquake in Japan. We determine the location of the horizontal edges of the mainshock fault relative to the aftershock hypocentres, with an accuracy of approximately 200 m. We find that aftershocks rarely occur near the horizontal edges and extensions of the fault. We propose that the mainshock rupture was arrested within areas characterised by substantial stress relaxation prior to the main earthquake. This stress relaxation along fault edges could explain why mainshocks are rarely followed by further large earthquakes.

Focal mechanism solutions for roof collapse in deep mine

2015 ◽  
Vol 6 (1) ◽  
pp. 22
Author(s):  
Chun lai Wang ◽  
Hui Fu ◽  
Fu li Wang ◽  
Wei qiang Li ◽  
Ming Luo ◽  
...  
Keyword(s):  
Focal Mechanism ◽  
Deep Mine ◽  
Roof Collapse ◽  
Focal Mechanism Solutions

scholarly journals 2013 Seismic swarm recorded in Galati area, Romania: focal mechanism solutions

2016 ◽  
Vol 52 (1) ◽  
pp. 53-67 ◽  
Author(s):  
Andreea Craiu ◽  
Marius Craiu ◽  
Mihail Diaconescu ◽  
Alexandru Marmureanu
Keyword(s):  
Focal Mechanism ◽  
Focal Mechanism Solutions ◽  
Seismic Swarm

Microseismicity and tectonics of the Nevada Seismic Zone

1971 ◽  
Vol 61 (5) ◽  
pp. 1413-1432 ◽  
Author(s):  
Frank J. Gumper ◽  
Christopher Scholz
Keyword(s):  
Sierra Nevada ◽  
Focal Mechanism ◽  
Basin And Range ◽  
Mono Lake ◽  
Tectonic Activity ◽  
Seismic Zone ◽  
Owens Valley ◽  
Western Basin ◽  
Focal Mechanism Solutions ◽  
Composite Focal Mechanism

abstract Microseismicity, composite focal-mechanism solutions, and previously-published focal parameter data are used to determine the current tectonic activity of the prominent zone of seismicity in western Nevada and eastern California, termed the Nevada Seismic Zone. The microseismicity substantially agrees with the historic seismicity and delineates a narrow, major zone of activity that extends from Owens Valley, California, north past Dixie Valley, Nevada. Focal parameters indicate that a regional pattern of NW-SE tension exists for the western Basin and Range and is now producing crustal extension within the Nevada Seismic Zone. An eastward shift of the seismic zone along the Excelsior Mountains and left-lateral strike-slip faulting determined from a composite focal mechanism indicate transform-type faulting between Mono Lake and Pilot Mountain. Based on these results and other data, it is suggested that the Nevada Seismic Zone is caused by the interaction of a westward flow of mantle material beneath the Basin and Range Province with the boundary of the Sierra Nevada batholith.

scholarly journals A functional tool to explore the reliability of micro-earthquake focal mechanism solution for seismotectonic purposes

2021 ◽  
Author(s):  
Guido Maria Adinolfi ◽  
Raffaella De Matteis ◽  
Rita De Nardis ◽  
Aldo Zollo
Keyword(s):  
Focal Mechanism ◽  
Fault Plane ◽  
Focal Mechanisms ◽  
Seismic Network ◽  
Fault System ◽  
Focal Mechanism Solution ◽  
Fault Plane Solutions ◽  
Stress Regime ◽  
Focal Mechanism Solutions ◽  
Earthquake Focal Mechanism

Abstract. Improving the knowledge of seismogenic faults requires the integration of geological, seismological, and geophysical information. Among several analyses, the definition of earthquake focal mechanisms plays an essential role in providing information about the geometry of individual faults and the stress regime acting in a region. Fault plane solutions can be retrieved by several techniques operating in specific magnitude ranges, both in the time and frequency domain and using different data. For earthquakes of low magnitude, the limited number of available data and their uncertainties can compromise the stability of fault plane solutions. In this work, we propose a useful methodology to evaluate how well a seismic network used to monitor natural and/or induced micro-seismicity estimates focal mechanisms as function of magnitude, location, and kinematics of seismic source and consequently their reliability in defining seismotectonic models. To study the consistency of focal mechanism solutions, we use a Bayesian approach that jointly inverts the P/S long-period spectral-level ratios and the P polarities to infer the fault-plane solutions. We applied this methodology, by computing synthetic data, to the local seismic network operated in the Campania-Lucania Apennines (Southern Italy) to monitor the complex normal fault system activated during the Ms 6.9, 1980 earthquake. We demonstrate that the method we propose can have a double purpose. It can be a valid tool to design or to test the performance of local seismic networks and more generally it can be used to assign an absolute uncertainty to focal mechanism solutions fundamental for seismotectonic studies.

Spatial Distribution of Intermediate Earthquakes and Focal Mechanism Solutions in the Pamir-Hindu Kush Region

2007 ◽  
Vol 50 (5) ◽  
pp. 1256-1264 ◽  
Author(s):  
Xiao-Ting LOU ◽  
Gui-Ling DIAO ◽  
Guo-Yang YE ◽  
Jie-Yuan NING
Keyword(s):  
Spatial Distribution ◽  
Focal Mechanism ◽  
Focal Mechanism Solutions ◽  
Hindu Kush
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