Four similar earthquakes in central California

Geller, Robert J.; Mueller, Charles S.

doi:10.1029/gl007i010p00821

Cited by 284 publications

(211 citation statements)

References 6 publications

Supporting

Mentioning

206

Contrasting

Unclassified

Order By: Relevance

“…The same kind of phenomena as the clustering structure of microearthquakes have been observed in various regions as the existence of earthquake families with similar waveforms (e.g., HAMAGUCHI and HASEGAWA, 1975;GELLER and MUELLER, 1980;OKADA et al, 1981;PECHMANN and KANAMORI, 1982;URABE, 1982;TSUJIURA, 1983 a, b;MOTOYA, 1984;ITO, 1985). This study is the first, however, to reveal the fine structure of clusters and its influence on the fracture process of microearthquakes.…”

Section: Kasai Earthquake Groupmentioning

confidence: 90%

Clustering structure and fracture process of microearthquake sequences.

Nishigami¹

1987

J,Phys,Earth

View full text Add to dashboard Cite

In order to elucidate the generating mechanism of microearthquakes, we analyzed three earthquake groups around the Yamasaki fault system in southwest Japan. It has been revealed that the distribution of hypocenters in an earthquake group consists of several "clusters." Events in each cluster have the common fault plane with linear dimension of about 100 to 200 m. The fault plane is considered to be a small unit of heterogeneous structure in the source region, and it imposes restrictions on the fracture process of microearthquake sequences. Events with M@/*8/@2.5 are fractures within one fault plane. On the other hand, events with M@/*9/@2.5-3.0 are found to be multiple shocks composed of two or three subevents. It was made clear that one of the multiple shocks fractured two fault planes of clusters successively. In a series of fractures on the fault plane of a cluster, the migration of hypocenters and the increase of stress drops are observed before the final complete fracture. This can be explained by small strong patches on the fault plane of the cluster.

show abstract

Section: Kasai Earthquake Groupmentioning

confidence: 90%

Clustering structure and fracture process of microearthquake sequences.

Nishigami¹

1987

J,Phys,Earth

View full text Add to dashboard Cite

show abstract

“…Hamaguchi and Hasegawa (1975) studied a large number of aftershocks of the 1968 Tokachi-Oki earthquake having similar wave forms, and concluded that these similar events occurred at approximately the same location under the same mechanical condition. Geller and Mueller (1980) ' CT (i, il found four small earthquakes with similar wave forms on the San Andreas Fault in Central California, and suggested that they may represent breakings of an asperity where stress is repeatedly concentrated and released.…”

Section: Discussionmentioning

confidence: 99%

The Nature of Seismicity Patterns Before Large Earthquakes

Kanamori

2013

Maurice Ewing Series

214

View full text Add to dashboard Cite

Abstract. Various seismicity patterns before major earthquakes have been reported in the literature. They include foreshocks (broad sense), preseismic quiescence, precursory swarms, and doughnut patterns. Although many earthquakes are preceded by all, or some, of these patterns, their detail differ significantly from event to event. In order to examine the details of seismicity patterns on as uniform a basis as possible, we made space-time plots of seismicity for many large earthquakes by using the NOAA and JMA catalogs. Among various seismicity patterns, preseismic quiescence appears most common, the case for the 1978 Oaxaca earthquake being the most prominent.Although the nature of other patterns varies from event to event, a common physical mechanism may be responsible for these patterns; details of the pattern are probably controlled by the tectonic environment (fault geometry, strain rate) and the heterogeneity of the fault plane. Here a simple asperity model is introduced to explain these seismicity patterns. In this model, a fault plane with an asperity is divided into a number of subfaults. The subfaults within the asperity are, on the average, stronger than those in the surrounding weak zone. As the tectonic stress increases, the subfaults in the weak zone break in the form of background small earthquakes. If the frequency distribution of the strength of the subf aults has a sharp peak, a precursory swarm occurs. By this time, most of the subfaults in the weak zone are broken and the fault plane becomes seismically quiet. As the tectonic stress increases further, eventually the asperity breaks and sympathetic displacement occurs on the entire fault zone in the form of the main shock. Foreshocks do or do not occur depending upon the distribution of the strength of the subfaults within the asperity. Since the spatio-temporal change in the stress on the fault plane is most likely to dictate the change in seismicity patterns, detailed analysis of seismicity patterns would provide a most direct clue to the state of stress in the fault zone. However, because of the large variation from event to event, seismicity pattern alone is not a definitive tool for earthquake prediction; measurements of other physical parameters such as the spectra, the mechanism and the wave forms of the background events should be made concurrently.

show abstract

“…The "multiplet blast" configuration was performed to record "multiplets" a term which refers, in classic seismology, to a group of seismic events showing the following characteristics (Geller and Mueller, 1980;Poupinet et al 1984;Lees 1998;Slunga et al, 1995;Moriya et al 2006;Gibowicz, 2006): similar wave form; different time origin; considered as the result of the relaxation of constrain of a single fracture or fault, similar source mechanisms; close location; different magnitude. The recorded data might indeed be used to test the capabilities of "relative" location algorithms compared to "absolute" and classical seismic location algorithms.…”

Section: Methodsmentioning

confidence: 99%

Management of Post-mining Large-scale Ground Failures: Blast Swarms Field Experiment for Calibration of Permanent Microseismic Early-warning Systems

Contrucci

Klein

Bigarré

et al. 2009

Pure Appl. Geophys.

View full text Add to dashboard Cite

ACCEPTED May 09, PAGEOPH.Abstract -In France, decades of coal and iron ore mining have left extensive underground cavities beneath or in the vicinity of urban areas. This poses an environmental challenge for society. To ensure post-mining risk management and public safety, wherever remediation is not possible, numerous real-time microseismic monitoring systems are being installed. The objective is to detect remote rock mass fracturing processes, precursory events and acceleration phases for appropriate and timely action. Although no consistent collapse has occurred in any of the monitored areas yet, single 3D probes record many microseismic events of very low amplitude which create difficulties in the quantitative data analysis. The development of specific quantitative processing has therefore become a major issue in our research work. For that purpose, a field experiment was carried out on six of the instrumented sites. It consisted of sequences of small blasts in mine pillars which were accurately controlled in terms of the location, orientation and energy of the explosive source. The data analysis was used to calibrate parameters (velocity model, 3D sensor orientation, etc.) for reliable 3D localization and to develop an empirical law to estimate the source energy from the sensor energy. This work now enables us to analyze real microseismic events with a much better level of accuracy and to obtain enough information and confidence to discuss these data in terms of site stability.

show abstract

Four similar earthquakes in central California

Cited by 284 publications

References 6 publications

Clustering structure and fracture process of microearthquake sequences.

Clustering structure and fracture process of microearthquake sequences.

The Nature of Seismicity Patterns Before Large Earthquakes

Management of Post-mining Large-scale Ground Failures: Blast Swarms Field Experiment for Calibration of Permanent Microseismic Early-warning Systems

Contact Info

Product

Resources

About