Earthquake swarm examples and a look at the generation mechanism of the Vogtland/Western Bohemia earthquake swarms

Kurz, Jochen H.; Jahr, T.; Jentzsch, G.

doi:10.1016/j.pepi.2003.12.007

Cited by 41 publications

(25 citation statements)

References 24 publications

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“…Such activity is likely to be 397 caused by fluids as was observed in different parts of the 398 world (e.g. Kurz et al, 2004). A close relation of swarm-399 like seismic activity and rising fluids in the Earth's crust 400 was also verified using numerical modeling approaches 401 (e.g.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 75%

Microseismic activity in the Hellenic Volcanic Arc, Greece, with emphasis on the seismotectonic setting of the Santorini–Amorgos zone

et al. 2006

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Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 75%

Microseismic activity in the Hellenic Volcanic Arc, Greece, with emphasis on the seismotectonic setting of the Santorini–Amorgos zone

et al. 2006

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“…A prerequisite for Yamashita's model are continuously open faults which serve for the fluid supply. Kurz et al (2004) introduced a model for the West Bohemia/Vogtland swarms with respect to the actual conditions in this area. They showed that the rate of deformation and stress accumulation caused purely by the regional stress field is not big enough to generate earthquake swarms in such relatively short periods as observed in this region.…”

Section: Earthquake Swarms and Their Modelsmentioning

confidence: 99%

“…The recent 20032004 Ubaye earthquake swarm in the French Alps could be viewed as a quasi intraplate one because it is somehow related to the boundary between Euroasia and the colliding Adriatic microplate (Jenatton et al, 2007). The origin of the intraplate earthquake swarms is usually explained as an interaction of the tectonic stress and pore pressure of high-pressurised crustal fluids in a subcritically loaded rock environment (Yamashita, 1999;Kurz et al, 2004). The crustal fluids are presumed to be some mixtures of gases released from the upper mantle into the Earth's crust and meteoric water.…”

Section: Introductionmentioning

confidence: 99%

Role of crustal fluids in triggering the West Bohemia/Vogtland earthquake swarms: Just what we know (a review)

Horálek

Fischer

2008

Stud Geophys Geod

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We summarise the results of seismological studies related to triggering mechanisms, driving forces and source processes of the West Bohemia/Vogtland earthquake swarms with the aim to disclose the role of crustal fluids in the preparation, triggering and governing of the swarms. We present basic characteristics distinguishing earthquake swarms from tectonic mainshock-aftershock sequences and introduce existing earthquakes swarm models. From the statistical characteristics and time-space distribution of the foci we infer that self-organization is a peculiarity of West Bohemia/Vogtland swarms. We discuss possible causes of the foci migration in these swarms from the viewpoint of coseismic and/or post-seismic stress changes and diffusion of the pressurized fluids, and we summarize hitherto published models of triggering the 2000-swarm. Attention is paid to the source mechanisms, particularly to their non-shear components. We consider possible causes of different source mechanisms of the 1997-and 2000-swarms and infer that pure shear processes controlled solely by the regional tectonic stress prevail in them, and that additional tensile forces may appear only at unfavourably oriented faults. On data from the fluid injection experiment at the HDR site Soultz (Alsace), we also show that earthquakes triggered by fluids can represent purely shear processes. Thus we conclude that increased pore pressure of crustal fluids in the region plays a key role in bringing the faults from the subcritical to critical state. The swarm activities are mainly driven by stress changes due to co-seismic and post-seismic slips, which considerably depend on the frictional conditions at the fault; crustal fluids keep the fault in a critical state. An open question still remains the cause of the repeatedly observed almost simultaneous occurrence of seismic activity in different focal zones in a wider area of West Bohemia/Vogtland. The analysis of the space-time relations of seismicity in the area between 1991 and 2007 revealed that during a significant part of this time span the seismicity was switching among distant focal zones. This indicates a common triggering force which might be the effect of an increase of crustal-fluid pore-pressure affecting a wider epicentral region. K e y w o r d s : West Bohemia/Vogtland, earthquake swarms, crustal fluids, triggering of earthquakes, models of earthquake swarms J. Horálek and T. Fischer 456 Stud. Geophys. Geod., 52 (2008)

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“…The swarm model 6.1. The existing models explaining swarm sequences Several mechanisms have been proposed for the earthquake swarm generation and are succinctly summarized in Kurz et al 2003 and2004 and other related publications. The models are conceptualized in a way that they are complementing one another.…”

Section: Variations In Spatio-temporal B-valuesmentioning

confidence: 99%

“…Within this premise, a model combining the hydro fracturing with respect to periodic pore pressure variations and temperature changes has been proposed (Kurz et al, 2004) for swarm generation in Vogtland/Western Bohemia earthquake swarm region.…”

Section: Variations In Spatio-temporal B-valuesmentioning

confidence: 99%

Incipient status of dyke intrusion in top crust – evidences from the Al-Ays 2009 earthquake swarm, Harrat Lunayyir, SW Saudi Arabia

Mukhopadhyay

Mogren

Mukhopadhyay

et al. 2013

Geomatics, Natural Hazards and Risk

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The 2009 earthquake-swarm in the Al-Ays volcanic zone in Harrat-Lunayyir in NW Saudi-Arabia is unique because of its intense character and focal-depth distribution at two depth bands (5-10 and 15-20 km) in upper crust without volcanic eruption. We investigate an anatomy of the dyke-intrusion model that supports the mechanism for the swarm itself with seismotectonics, pore pressure diffusion process and inference model. Inferred dyke-intrusion initially started at depth had a five-day peak period (15-20 May 2009) since inception of eventrecordings, following which the activity diminished. The process of pore pressure perturbation and resultant ''r-t plot'' with modelled diffusivity (D ¼ 0.01) relates the diffusion of pore pressure to seismic sequence in a fractured poro-elastic fluidsaturated medium. The spatio-temporal b-values show high b-values (41.3) along the zone of dyke intrusion (length 10 km and height 5 km) at *20km depth. The main-shock and other prominent earthquakes originated on a moderate b-value zone (*1.0). Temporal b-value analysis indicates an exceptionally low b-value (*0.4) during the main-shock occurrence. The AlAys lava-field is inferred to underlie a seismic volume trending NW-SE bounded on both sides by two NW-SE trending fault systems, dipping 40-508 opposite to each other within a proposed nascent rift setting.

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Earthquake swarm examples and a look at the generation mechanism of the Vogtland/Western Bohemia earthquake swarms

Cited by 41 publications

References 24 publications

Microseismic activity in the Hellenic Volcanic Arc, Greece, with emphasis on the seismotectonic setting of the Santorini–Amorgos zone

Microseismic activity in the Hellenic Volcanic Arc, Greece, with emphasis on the seismotectonic setting of the Santorini–Amorgos zone

Role of crustal fluids in triggering the West Bohemia/Vogtland earthquake swarms: Just what we know (a review)

Incipient status of dyke intrusion in top crust – evidences from the Al-Ays 2009 earthquake swarm, Harrat Lunayyir, SW Saudi Arabia

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