Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...44..149r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 44, Issue 2, p. 149-159.
Physics
5
Scientific paper
About 570 microearthquakes of magnitude -2.4 to 3.2 occurred during June to August, 1984 near the newly impounded Sriramsagar reservoir (19°N, 78°E) in Andhra Pradesh State, India. The seismic phenomenon unknown in the area caused panic among the villagers. The tremors started 10 months after the reservoir was filled to its capacity and the epicentres were located about 10 km from the reservoir. A network of seismic stations was operated around the epicentral area through which 36 epicentres were located giving a NW trend in an area of about 1.5 km × 4 km. The composite fault plane solution indicates right-lateral strike-slip faulting along the NW trending nodal plane matching with the general drainage pattern in the area, inferred NW faults in the area, and known fault 60 km east. The marginal faults in the Godavari Rift Valley also trend in a NW direction. The depth of the tremeors was within a few hundred metres to a maximum of 1.5 km and all the tremors were associated with blasting sound. The largest earthquake of magnitude 3.2 was felt upto a distance of 8 km. This as well as four other events of magnitude 2.2 caused minor cracks and falling of mud plaster in D-type houses, which are poorly constructed mud houses.
The discriminatory seismic characteristics like foreshock-aftershock pattern, decay rate of aftershocks and magnitude ratio M1/M0 suggest that the seismicity was reservoir-induced. The seismic diffusivity of 4 × 104 cm2 s-1 is within the range for other reservoirs. The large scale flooding in the previous year might have also weakened the subterranean beds.
The larger events of the sequence having a magnitude of 2.2 and greater were associated with foreshock-aftershock activity. Increased foreshock activity for a few days and about a day of quiescence prior to some larger events was also noticed.
Rao Ramachandka B.
Rao V. R. K. C.
Rastogi B. K.
No associations
LandOfFree
Microearthquake investigations near Sriramsagar reservoir, Andhra Pradesh State, India does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Microearthquake investigations near Sriramsagar reservoir, Andhra Pradesh State, India, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microearthquake investigations near Sriramsagar reservoir, Andhra Pradesh State, India will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1740721