Scientific Reports
Scientific Reports
>Received: by melville.UCSD.EDU (8.9.3+Sun/UCSDUUCPGENERIC.4)
id PAA15897 to ; Fri, 23 Jun 2000 15:31:30 GMT
Date: Fri, 23 Jun 2000 15:31:30 GMT
From: melville!jacobson@sdsioa.UCSD.EDU (Dan Jacobson)
To: shipsked@ucsd.edu
Subject: NEMO04 Science Report
Cc: dorman@sdsioa.UCSD.EDU, jacobson@sdsioa.UCSD.EDU, scg@sdsioa.UCSD.EDU
Following our successful recovery of our ocean-bottom seismometers
after their six-month stay on the seafloor off the Nicoya Peninsula of
Costa Rica, we have been conducting bathymetric, seismic reflection,
gravity and magnetic surveys off the coast of Mexico. During that
time the passage of hurricane Carlotta (gusts to 160 knots) nearby
forced us to work at the westward part of the area of primary
interest.
Today, however, the seas are glassy as we take our departure for San
Diego.
Dorman
>Received: by melville.UCSD.EDU (8.9.3+Sun/UCSDUUCPGENERIC.4)
id CAA24298 to ; Fri, 16 Jun 2000 02:11:41 GMT
Date: Fri, 16 Jun 2000 02:11:41 GMT
From: melville!jacobson@sdsioa.UCSD.EDU (Dan Jacobson)
To: shipsked@ucsd.edu
Subject: NEMO04 Science Report
Cc: dorman@sdsioa.UCSD.EDU, jacobson@sdsioa.UCSD.EDU, scg@sdsioa.UCSD.EDU
...
Date: Fri, 16 Jun 2000 01:42:06 +0000 (GMT)
From: LeRoy Dorman - NEMO04 <dorman@melville>
Subject: Weekly report
To: jacobson@melville
...
The purpose of cruise NEMO-4 is the recovery of 14 Ocean-Bottom
Seismometers (OBSs) deployed earlier off the margin of Costa Rica in a
study of the seismogenic zone (the location of large, sometimes
tsunamigenic) earthquakes at this convergent plate margin. This work
is supported by the NSF under the MARGINS program in collaboration
with colleagues at the U of Miami, UCSC, JPL and GEOMAR. The OBSs
were first deployed in September, 1999 off the Osa Peninsula,
retrieved, serviced and redeployed off the Nicoya Peninsula in
December, 1999. Both of the previous cruises were carried out from
the German vessel SONNE. The specific purpose of the OBS deployments,
undertaken in concert with temporary land stations, is to determine
accurate locations of the shallow earthquakes. Depth determinations,
in particular, are inaccurate without having instruments directly over
the quakes.
Prior to arrival of MELVILLE in Pto. Caldera, CR, we had received
reports that the port was blockaded land and sea by a labor dispute,
but this did not interfere either with the shipment of our laboratory
van which had been stored at the Universidad Nacional in Heredia, nor
with the loading aboard ship. We recovered the OBSs over the course
of two long days and are now conducting multibeam bathymetric surveys
in transit to further survey work off Mexico. The instruments
returned over a tenth of a terabyte of data after their six-month
deployment, with only two instruments containing partial data sets.
The weather has been fine and we are making good speed.
Dorman
This cruise is being funded by a grant from the National Science Foundation
Email:
Return to
Ship