Seismic quiescence prior to the 2000 &lt;i&gt;M&lt;/i&gt;=6.8 Nemuro Peninsula earthquake

Huang, Qinghua; Sobolev, G. A.

doi:10.2183/pjab.77.1

Cited by 14 publications

(11 citation statements)

References 2 publications

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“…However, the Izmit event did not occur immediately after the activation stage, but with a delay of about two years. A similar time delay after the activation phase was also reported for the M = 7.7 1997 December 5 Kamchatka earthquake and the M = 6.8 2000, January 28 Nemuro earthquake (Sobolev & Tyupkin 1999; Huang & Sobolev 2001).…”

Section: Discussionsupporting

confidence: 79%

“…The temporal variation of the seismicity patterns of the 1999 Izmit earthquake revealed by the RTL algorithm showed similar characteristics to those obtained before strong earthquakes in Kamchatka (Sobolev & Tyupkin 1997, 1999) and Japan (Huang & Sobolev 2001, 2002; Huang & Nagao 2002; Huang et al 2001). The similarity in these variations of seismicity patterns prior to strong earthquakes in different tectonic regions may reflect the natural evolution of the seismogenic process.…”

Section: Discussionsupporting

confidence: 69%

“…The dimension of the quiescence zone reached a few hundred kilometres, while the activation zone was generally in order of several tens of kilometres. Similar variations of seismicity patterns of the 1995 M = 7.2 Kobe earthquake, the 2000 M = 6.8 Nemuro Peninsula earthquake, and the 2000 M = 7.3 Tottori earthquake were obtained recently using the earthquake catalogue of the Japan Meteorological Agency (JMA) (Huang & Sobolev 2001, 2002; Huang & Nagao 2002; Huang et al 2001).…”

Section: Introductionsupporting

confidence: 74%

“…We found that the changing M min gives similar results, as long as the number of events for each M min is sufficient for valid statistical analysis. Because different magnitude‐frequency relations may hold for small and large earthquakes (for instance, Ikeya & Huang 1997), in our previous study on the 2000 January 28 Nemuro Peninsula earthquake(Huang & Sobolev 2001), we introduced the upper cut‐off magnitude M max . Detailed investigation indicated that introducing M max has little influence on our results (Huang & Sobolev 2002).…”

Section: Discussionmentioning

confidence: 97%

“…Taking into account reports of seismic quiescence around the rupture zone and our previous experiences in Kamchatka, Kobe, and Hokkaido (Sobolev & Tyupkin 1997, 1999; Sobolev et al 2002; Huang & Sobolev 2001; Huang et al 2001), we adopted a characteristic distance r 0 = 50 km that is a threshold distance R max = 2 r 0 = 100 km. We also adopted a characteristic time‐span t 0 = 1 yr that is a threshold time‐span T max = 2 t 0 = 2 yr, based on our previous experiences and the observation that duration of seismic quiescence is generally of the order of one year.…”

Section: Methodsmentioning

confidence: 99%

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Precursory seismicity changes associated with the 1999 August 17 Izmit (Turkey) earthquake

Huang¹,

Öncel

Соболев

2002

Geophysical Journal International

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Summary We investigated precursory seismicity in and around the epicentral zone of the Mw= 7.4 1999 August 17 Izmit (Turkey) earthquake, by applying a statistical method—the RTL (Region–Time–Length) algorithm—to earthquake catalogues derived from that for the period 1981–1999 of Kandilli Observatory and Earthquake Research Institute (KOERI). The derived catalogues are complete for events MD≥ 3 in most of western Turkey. After declustering aftershocks, we investigated the seismicity patterns preceding the Izmit event at local (Izmit tectonic zone) and national (Turkey) scales. The RTL parameter indicates that a period of seismic quiescence started at the end of 1995 and reached a minimum in December 1996. An activation phase lasting about three months followed. The main shock in Izmit and vicinity did not occur when the seismicity returned to its background level, but occurred with a delay of nearly 2.5 yr. We present a new parameter to quantify the spatial distribution of seismic quiescence. The results from both catalogues indicate that a significant quiescence anomaly appeared in 1996 around the epicenter of the Izmit earthquake. The primary characteristics of the seismicity patterns prior to the Izmit earthquake are similar to those obtained for large events in Russia and Japan. The variations of seismicity patterns revealed by the RTL algorithm may offer better understanding of the physical nature of seismo‐tectonics and provide useful information for seismic hazard estimation. The varying characteristics of the Izmit and other events may reflect the difference between seismo‐tectonics in Turkey and in other regions such as Russia and Japan.

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