Recent Seismic Activity in the Bejaia–Babors Region (Northeastern Algeria): The Case of the 2012–2013 Bejaia Earthquake Sequences

2021 ◽  
Author(s):  
Oualid Boulahia ◽  
Issam Abacha ◽  
AbdelKarim Yelles-Chaouche ◽  
Hichem Bendjama ◽  
Abdelaziz Kherroubi ◽  
...  
Keyword(s):  
Seismic Activity ◽  
Earthquake Sequences ◽  
Northeastern Algeria

A study of the aftershocks and focal mechanism of the Salinas-Watsonville earthquakes of August 31 and September 14, 1963

1965 ◽  
Vol 55 (1) ◽  
pp. 85-106 ◽  
Author(s):  
Agustin Udias
Keyword(s):  
Focal Mechanism ◽  
Seismic Activity ◽  
Main Shock ◽  
San Andreas Fault ◽  
San Andreas ◽  
Principal Axes ◽  
Mobile Stations ◽  
Earthquake Sequences ◽  
Background Seismic Activity

Abstract The earthquake sequences connected with the earthquakes of August 31 and September 14, 1963 in the Salinas-Watsonville region of California are here studied with reference to the background seismic activity. A very favorable distribution of permanent and mobile stations in this area permits the analysis to include earthquakes of small magnitudes. The mechanism of the larger aftershocks of both sequences is found to be similar to the mechanism of the main shock of September 14, 1963. The orientation of the principal axes of stress derived from the focal mechanism of the September 14 earthquake, is related to the strike of the San Andreas fault.

Point-process models with linearly parametrized intensity for application to earthquake data

1986 ◽  
Vol 23 (A) ◽  
pp. 291-310 ◽  
Author(s):  
Yosihiko Ogata ◽  
Koichi Katsura
Keyword(s):  
Seismic Activity ◽  
Process Models ◽  
Evolutionary Trend ◽  
Conditional Intensity ◽  
Data Set ◽  
Technical Aspects ◽  
Point Process Models ◽  
Earthquake Sequences ◽  
Flexible Models ◽  
Earthquake Data

It is demonstrated that linear parametrization of the conditional intensity provides systematic classes of flexible models which are reasonably useful for calculating maximum likelihoods. To exemplify the modelling, seismic activity around Canberra is decomposed into components of evolutionary trend, clustering and periodicity. The causal relationship between earthquake sequences from two seismic regions is also analysed for a certain Japanese earthquake data set.Some technical aspects of the modelling and calculations are described.

Point-process models with linearly parametrized intensity for application to earthquake data

1986 ◽  
Vol 23 (A) ◽  
pp. 291-310 ◽  
Author(s):  
Yosihiko Ogata ◽  
Koichi Katsura
Keyword(s):  
Seismic Activity ◽  
Process Models ◽  
Evolutionary Trend ◽  
Conditional Intensity ◽  
Data Set ◽  
Technical Aspects ◽  
Point Process Models ◽  
Earthquake Sequences ◽  
Flexible Models ◽  
Earthquake Data

It is demonstrated that linear parametrization of the conditional intensity provides systematic classes of flexible models which are reasonably useful for calculating maximum likelihoods. To exemplify the modelling, seismic activity around Canberra is decomposed into components of evolutionary trend, clustering and periodicity. The causal relationship between earthquake sequences from two seismic regions is also analysed for a certain Japanese earthquake data set. Some technical aspects of the modelling and calculations are described.

Relative quiescence within the Jiashi swarm in Xinjiang, China: an application of the ETAS point process model

2001 ◽  
Vol 38 (A) ◽  
pp. 213-221 ◽  
Author(s):  
Li Ma ◽  
Jiancang Zhuang
Keyword(s):  
Point Process ◽  
Seismic Activity ◽  
Process Model ◽  
Aftershock Sequence ◽  
Tianshan Mountain ◽  
Point Process Model ◽  
Epidemic Type Aftershock Sequence ◽  
Big Events ◽  
Earthquake Sequences ◽  
Swarm Activity

This paper uses the epidemic-type aftershock sequence (ETAS) point process model to study certain seismicity features of the Jiashi swarm of certain earthquakes, investigating in particular whether there is relative quiescence prior to the quite big events within the Jiashi sequence. The seven earthquake sequences studied occurred in the region of Jiashi, south of Tianshan Mountain, Xinjiang, China. The particular ETAS model that is developed is consistent with the reality of seismic activity. The various features of Jiashi swarm activity can be described as focusing in different stages. There is obvious precursory quiescence prior to most big events with Ms ≥ 6.0 within the Jiashi swarm. Thus, checking for relative quiescence can be use for earthquake prediction.

Relative quiescence within the Jiashi swarm in Xinjiang, China: an application of the ETAS point process model

2001 ◽  
Vol 38 (A) ◽  
pp. 213-221 ◽  
Author(s):  
Li Ma ◽  
Jiancang Zhuang
Keyword(s):  
Point Process ◽  
Seismic Activity ◽  
Process Model ◽  
Aftershock Sequence ◽  
Tianshan Mountain ◽  
Point Process Model ◽  
Epidemic Type Aftershock Sequence ◽  
Big Events ◽  
Earthquake Sequences ◽  
Swarm Activity

This paper uses the epidemic-type aftershock sequence (ETAS) point process model to study certain seismicity features of the Jiashi swarm of certain earthquakes, investigating in particular whether there is relative quiescence prior to the quite big events within the Jiashi sequence. The seven earthquake sequences studied occurred in the region of Jiashi, south of Tianshan Mountain, Xinjiang, China. The particular ETAS model that is developed is consistent with the reality of seismic activity. The various features of Jiashi swarm activity can be described as focusing in different stages. There is obvious precursory quiescence prior to most big events with Ms ≥ 6.0 within the Jiashi swarm. Thus, checking for relative quiescence can be use for earthquake prediction.

Shale, Quakes, and High Stakes: Regulating Fracking-Induced Seismicity in Oklahoma, USA and Lancashire, UK

2019 ◽  
Vol 3 (1) ◽  
pp. 1-14
Author(s):  
Miriam R. Aczel ◽  
Karen E. Makuch
Keyword(s):  
United States ◽  
Hydraulic Fracturing ◽  
Shale Gas ◽  
Seismic Activity ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
High Volume ◽  
The United States ◽  
Horizontal Drilling ◽  
Induced Seismic Activity

High-volume hydraulic fracturing combined with horizontal drilling has “revolutionized” the United States’ oil and gas industry by allowing extraction of previously inaccessible oil and gas trapped in shale rock [1]. Although the United States has extracted shale gas in different states for several decades, the United Kingdom is in the early stages of developing its domestic shale gas resources, in the hopes of replicating the United States’ commercial success with the technologies [2, 3]. However, the extraction of shale gas using hydraulic fracturing and horizontal drilling poses potential risks to the environment and natural resources, human health, and communities and local livelihoods. Risks include contamination of water resources, air pollution, and induced seismic activity near shale gas operation sites. This paper examines the regulation of potential induced seismic activity in Oklahoma, USA, and Lancashire, UK, and concludes with recommendations for strengthening these protections.

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