Occurrence of anomalous seismic activity preceding large to great earthquakes in northeast India region with special reference to 6 August 1988

Singh, Harendra; Shanker, D.; Singh, Vijay Pratap

doi:10.1016/j.pepi.2004.09.004

Cited by 8 publications

(15 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has already been established that medium to large earthquakes are preceded by epochs of abnormal seismicity patterns including background (normal) seismicity, anomalous seismicity (swarms), quiescence and foreshocks (KELLEHER and SAVING, 1977;EVISON, 1977a,b;MOGI, 1977;KANAMORI, 1981;SINGH et al, 1982;SINGH and SINGH, 1984;OHNAKA, 1984OHNAKA, -1985Singh, 1986, 1989;Singh et al 2005;PAUDYAL and SINGH, 2007). We have also observed that moderate to great earthquakes in the northeast India region were preceded by well-defined anomalous seismicity phases.…”

Section: Discussionmentioning

confidence: 99%

“…December, 1984 earthquake of m b 5.6 that have occurred in the northeast India region GUPTA and SINGH (1986) and Singh et al (2005) systematically analyzed the time series of earthquakes associated with several large main shocks in the region, including both of the great earthquakes.…”

Section: Study Area and Geological Backgroundmentioning

confidence: 99%

“…The preparatory areas were observed to be elliptical and oriented in the direction of major tectonic features as shown in Figure 8. Detailed data analysis to search for the anomalous pattern prior to these main shocks was carried out by GUPTA and SINGH (1986) and Singh et al (2005). The 1964, 1976, 1984 and 1988 which were preceded by anomalous seismicity/earthquake swarms are shown in relation to the major tectonic features of the region.…”

Section: Predictive Regressionsmentioning

confidence: 99%

“…A sufficiently strong relation of this kind would suggest that the precursory phenomenon is an early stage in a long-term seismogenic process for major earthquakes. Studies in several parts of the Himalayas have established that the pattern of anomalous seismic activity in the form of earthquake swarms preceding small to great earthquakes occurs in the region (GUPTA and SINGH, 1986;SHANKER et al, 1995;SINGH et al, 2005). In view of its high seismic activity, including frequent disastrous earthquakes, the northeast India region is potentially the best tectonic belt in which to search for seismic precursors using the distribution of seismic activity in the space and time domains.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Searching for an Earthquake Precursor—A Case Study of Precursory Swarm as a Real Seismic Pattern Before Major Shocks

Shanker

Singh

Paudyal

et al. 2010

Pure Appl. Geophys.

Self Cite

View full text Add to dashboard Cite

A long-range correlation between earthquakes is indicated by some phenomena precursory to strong earthquakes. Most of the major earthquakes show prior seismic activity that in hindsight seems anomalous. The features include changes in regional activity rate and changes in the pattern of small earthquakes, including alignments on unmapped linear features near the (future) main shock. It has long been suggested that large earthquakes are preceded by observable variations in regional seismicity. Studies on seismic precursors preceding large to great earthquakes with M C 7.5 were carried out in the northeast India region bounded by the area 20°-32°N and 88°-100°E using the earthquake database from 1853 to 1988. It is observed that all earthquakes of M C 7.5, including the two great earthquakes of 1897 and 1950, were preceded by abnormally low anomalous seismicity phases some 11-27 years prior to their occurrence. On the other hand, precursory time periods ranged from 440 to 1,768 days for main shocks with M 5.6-6.5 for the period from 1963 to 1988. Furthermore, the 6 August, 1988 main shock of M 7.5 in the Arakan Yoma fold belt was preceded by well-defined patterns of anomalous seismicity that occurred during 1963-1964, about 25.2 years prior to its occurrence. The pattern of anomalous seismicity in the form of earthquake swarms preceding major earthquakes in the northeast India region can be regarded as one of the potential seismic precursors. Database constraints have been the main barrier to searching for this precursor preceding smaller earthquakes, which otherwise might have provided additional information on its existence. The entire exercise indicates that anomalous seismicity preceding major shocks is a common seismic pattern for the northeast India region, and can be employed for long-range earthquake prediction when better quality seismological data sets covering a wide range of magnitudes are available. Anomalous seismic activity is distinguished by a much higher annual frequency of earthquake occurrence than in the preceding normal and the following gap episodes.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Study Area and Geological Backgroundmentioning

confidence: 99%

Section: Predictive Regressionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Searching for an Earthquake Precursor—A Case Study of Precursory Swarm as a Real Seismic Pattern Before Major Shocks

Shanker

Singh

Paudyal

et al. 2010

Pure Appl. Geophys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Several researchers have worked for the identification of precursory swarm sequence that precedes the major earthquakes occurred in northeast India region: Gupta and Singh [6], Singh et al [7] and Shanker et al [8] for north-east India; Singh and Singh [9] for north-east India and Pamir; Singh et al, [10] for Burma-Szechwan region. In the present study such phenomenon has been investigated prior to all the moderate size earthquakes that occurred from 1963 to 2008 in Arakan-yoma region; and a total of three such mainshocks were found preceding with such anomalous seismicity pattern.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Seismicity Patterns Study of Three Mainshocks Occurred in Arakan-yoma Region

Panthi¹

2013

Himalayan Physics

View full text Add to dashboard Cite

Holocene Tectonic Movements and Earthquakes

Valdiya

2015

Society of Earth Scientists Series

View full text Add to dashboard Cite

Occurrence of anomalous seismic activity preceding large to great earthquakes in northeast India region with special reference to 6 August 1988

Cited by 8 publications

References 49 publications

Searching for an Earthquake Precursor—A Case Study of Precursory Swarm as a Real Seismic Pattern Before Major Shocks

Searching for an Earthquake Precursor—A Case Study of Precursory Swarm as a Real Seismic Pattern Before Major Shocks

Anomalous Seismicity Patterns Study of Three Mainshocks Occurred in Arakan-yoma Region

Holocene Tectonic Movements and Earthquakes

Contact Info

Product

Resources

About