Seismic activity in the snowy mountains region and its relationship to geological structures
- 1 January 1964
- journal article
- research article
- Published by Taylor & Francis in Journal of the Geological Society of Australia
- Vol. 11 (1), 89-106
- https://doi.org/10.1080/00167616408728562
Abstract
Forty‐four tremors which occurred in the Snowy Mountains of New South Wales during the years 1958–1962 have been accurately located, using a network of seismic stations operating in that area. The largest of these were a tremor of magnitude 5 north of Berridale in May, 1959, and one of magnitude 4 near Rock Flat in September, 1958. Fault plane analysis suggests that the former was caused by a high‐angle thrust movement along the plane of the Crackenback Fault, while the latter may be associated with the Murrumbidgee Fault. These conclusions are supported by macroseismic data. Twenty‐one minor shocks occurred in the vicinity of the Berridale tremor, and their strain release pattern is that of an after‐shock sequence. It is believed that they were produced as a result of secondary strains imposed by the original motion along an edge of the faulted block. The first motion data for these shocks is consistent with the hypothesis that the associated movements were transcurrent. With the decrease of activity in the Berridale region, tremors became more or less random in the Snowy Mountains. The strain release curve obtained for these movements suggests a gradual rebuilding of the stress field following the Berridale shock.Keywords
This publication has 8 references indexed in Scilit:
- Application of a seismograph network and electronic computer in near earthquake studiesBulletin of the Seismological Society of America, 1962
- Local earthquake location with an electronic computerBulletin of the Seismological Society of America, 1960
- The Mechanics of Oblique Slip FaultingGeological Magazine, 1959
- Seismic Recordings of Large Explosions in South-Eastern AustraliaAustralian Journal of Physics, 1959
- Mechanisms of the aftershocks of the Kern County, California, earthquake of 1952Bulletin of the Seismological Society of America, 1958
- Direction of faulting in certain earthquakes of the North Pacific*Bulletin of the Seismological Society of America, 1951
- Seismic investigations in the Boulder Dam area, 1940-1944, and the influence of reservoir loading on local earthquake activity*Bulletin of the Seismological Society of America, 1945
- On the estimation of focal depth from macroseismic data*Bulletin of the Seismological Society of America, 1941