Physics
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996georl..23.2425g&link_type=abstract
Geophysical Research Letters, Volume 23, Issue 18, p. 2425-2428
Physics
16
Seismology: Oceanic Crust, Tectonophysics: Earth'S Interior-Composition And State, Geodesy And Gravity: Instruments And Techniques
Scientific paper
Three borehole tensor strainmeters (BTSM) installed near Parkfield and separated by more than 5 km have established a good baseline of data spanning the past eight years. A significant change in the accumulation rate of shear strain (0.5 and 1.0 microstrain per year at two of the sites) commencing approximately in mid-1993 and continuing to 1995 is evident in these data. Some supporting evidence for a change in the strain rate at that time is seen in dilatometer data, geodetic measurements, fault zone properties and microearthquake locations. There was also an increase in medium level seismic activity (M=4.7 on 10/20/92; M=3.9 on 10/26/92; m=3.5 on 3/13/93; M=4.4 on 4/3/93; M=4.8 on 11/14/93) in the Middle Mountain area. While a rainfall induced strain may have caused the observed strain anomaly, we propose a more likely explanation is that aseismic slip at depth on a section of the fault south of Middle Mountain produced the observed strain anomaly. This anomaly is unique in the current data set.
Gladwin Michael T.
Gwyther Ross L.
Hart H. G. R.
Mee M.
No associations
LandOfFree
Anomalous shear strain at Parkfield during 1993-94 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 Anomalous shear strain at Parkfield during 1993-94, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anomalous shear strain at Parkfield during 1993-94 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-993392