Computer Science – Sound
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..135d&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 2, p. 135-138
Computer Science
Sound
76
Earthquakes, Geological Faults, Mid-Ocean Ridges, Ocean Bottom, Pacific Ocean, Rock Intrusions, Seismology, Injection, Sound Waves, Wave Propagation
Scientific paper
The CoAxial segment (Juan de Fuca Ridge) was the site of an intense swarm of earthquakes that began at 21:43 GMT on June 26, 1993 (Julian Day 177). The swarm started near 46 deg 15 min N and migrated northward over the next 40 hours to 46 deg 36 min N, where the majority of 676 events occurred during the following 3 weeks of activity. The earthquakes propagated NNE at a velocity of 0.3 +/- 0.1 m/s from the southern to northern swarm sites. The activity went undetected by land-based seismic networks along the Oregon and Washington coasts, suggesting that the earthquakes were all M equal to or less than 4.0. The character of this earthquake swarm is very similar to dike injections observed at Krafla and Kilauea Volcanoes. The earthquake activity and subsequent migration probably represent a lateral dike injection into faults and fissures comprising the CoAxial segment. The reservoir acting as the dike's source likely resides beneath, or to the south of, the initial southern swarm of earthquakes. The large magma supply at Axial Volcano cannot be ruled out as the source for the CoAxial dike, even though Axial Volcano exhibited no earthquake activity related to the CoAxial swarm. The T-wave earthquake swarm reported here is the first deep-ocean observation of volcanic seismicity associated with what most liekly was a mid-ocean ridge dike injection event.
Dziak Robert P.
Fox Christopher G.
Schreiner Anthony E.
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