eprintid: 2180
rev_number: 9
eprint_status: archive
userid: 2
dir: disk0/00/00/21/80
datestamp: 2019-01-23 14:32:47
lastmod: 2019-01-23 14:32:47
status_changed: 2019-01-23 14:32:47
type: article
metadata_visibility: show
creators_name: Eyidogan, Haluk
creators_name: Nabelek, John
creators_name: Toksoz, M. Nafi
corp_creators: Earth Resources Laboratory Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of TechnologyCambridge
corp_creators: Earth Resources Laboratory Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of TechnologyCambridge
corp_creators: Earth Resources Laboratory Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of TechnologyCambridge
title: The Gazli, USSR, 19 March 1984 earthquake: The mechanism and tectonic implications
subjects: MP1
subjects: MP2
subjects: RUZ
subjects: SHC
divisions: IP17
full_text_status: none
abstract: The fault parameters of the Gazli, USSR, earthquake of 19 March 1984 Ms = 7.0 were determined from the inversion of the GDSN long-period P and SH and short-period P seismograms. The frequency of the short-period seismograms was broadened by partially deconvolving the effect of the recording instruments. The earthquake represents a thrust fault with a small amount of a left-handed strike-slip component on a NE-SW trending fault dipping northwest. The average depth is 9 km. The rupture propagated essentially continuously while breaking several high stress asperities. Directivity of the observed waveforms indicates principal rupture direction from SE to NW. The total duration of rupture is about 13 sec. The average scalar seismic moment found from the long-period wave-forms is 2.5 × 1019 N-m.

In addition to the 1984 event, the Gazli region experienced two large (Ms = 7.0) earthquakes in 1976 and one medium size earthquake (Ms = 5.7) in 1978. The mechanisms of the 1976 events were studied by Hartzell (1980) and Kristy et al. (1980), and are thrust events striking in the general E-W direction. We determined the mechanism of the 1978 earthquake and find it similar to those of the 1976 earthquakes. An interesting feature of the Gazli earthquake sequence is the migration of activity from east to west along an arc shaped fault zone. Prior to 1976, the region was relatively aseismic, based on instrumental and historical seismicity data.
date: 1985-06
date_type: published
publication: Bulletin of the Seismological Society of America
volume: 75
number: 3
publisher: Seismological Society of America
pagerange: 661-675
issn: 0037-1106
official_url: https://pubs.geoscienceworld.org/ssa/bssa/article/75/3/661/102156/the-gazli-ussr-19-march-1984-earthquake-the
access_IS-EPOS: limited
owner: Publisher
citation:   Eyidogan, Haluk and Nabelek, John and Toksoz, M. Nafi  (1985) The Gazli, USSR, 19 March 1984 earthquake: The mechanism and tectonic implications.  Bulletin of the Seismological Society of America, 75 (3).  pp. 661-675.