Mathematics – Logic
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2131w&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 21, p. 2131-2134.
Mathematics
Logic
18
Earthquakes, Mid-Ocean Ridges, Sea Floor Spreading, Seismology, Geological Faults, Pacific Ocean
Scientific paper
Records from a seismic network deployed as part of an active tomography experiment at 9 deg 30 min N on the East Pacific Rise (EPR) provide an opportunity to characterize local microearthquake activity over an 8-day period. With the exception of the region around the 9 deg 03 min overlapping spreading center (OSC), no events were located on the rise axis. One microearthquake, located from P and S-wave arrival times, lies adjacent to the network, 18 km to the west of the rise axis. Five more events, located from P-wave and T-phase data, are to the south of the network. Three cluster around the western arm of the 9 deg 03 min OSC, while two are located 25-30 km to the east of the OSC. These results suggest that overlapping spreading centers may be the loci of substantial microearthquake activity and that at this location the normal faults that form on the young flanks of the EPR are active off-axis to distance of at least 20 km.
Dubois David L.
Purdy Geraldine M.
Solomon Sean C.
Toomey Douglas R.
Wilcock William S. D.
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