The June‐July 1993 seismo‐acoustic event at CoAxial segment, Juan de Fuca Ridge: Evidence for a lateral dike injection

The June‐July 1993 seismo‐acoustic event at CoAxial segment, Juan de Fuca Ridge: Evidence for... 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°15′N and migrated northward over the next 40 hours to ∼46°36′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−1 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 ≤ 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 likely was a mid‐ocean ridge dike injection event. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

The June‐July 1993 seismo‐acoustic event at CoAxial segment, Juan de Fuca Ridge: Evidence for a lateral dike injection

Loading next page...
 
/lp/wiley/the-june-july-1993-seismo-acoustic-event-at-coaxial-segment-juan-de-AivM5GiNIN
Publisher
Wiley
Copyright
Copyright © 1995 by the American Geophysical Union.
ISSN
0094-8276
eISSN
1944-8007
D.O.I.
10.1029/94GL01857
Publisher site
See Article on Publisher Site

Abstract

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°15′N and migrated northward over the next 40 hours to ∼46°36′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−1 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 ≤ 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 likely was a mid‐ocean ridge dike injection event.

Journal

Geophysical Research LettersWiley

Published: Jan 15, 1995

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create folders to
organize your research

Export folders, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off