Crossing the Dead Sea Fault System - First results of the near-vertical
seismic reflection study within project DESERT 2000
EOS Transactions, American Geophysical Union. Fall Meeting Supplement, 81, стр. T12C-08+. San Francisco, California, American Geophysical Union, (декабря 2000)Аннотация
During March 2000 a combined vibroseis/explosives near-vertical incidence
seismic reflection transect of 100 km length was carried out between
Ma'an/Jordan and Sede Boqer/Israel crossing the Dead Sea Transform
Fault System almost perpendicular. This experiment acts as the backbone
of the integrated seismic study DESERT 2000 performed by German,
Israelian, Jordanian, and Palestinian scientists and is closely related
to a wide-angle as well as a small-scale source and receiver array
seismic experiment. The near-vertical reflection component (NVR)
aims to image the crustal architecture down to the Moho and to resolve
the main fault geometry. The signals of a 90-fold vibroseis survey
(10-48 Hz, 24 s sweep length, 260.000 lbs peak force, 10-fold vertical
rate, 50 m vibrator point spacing) together with a single-fold explosion
survey (10 shots, 100 kg charge in 30 m depth) were recorded by one
and the same roll-along receiver line (180 channels, 4.5 Hz vertical
geophones, 100 m geophone spacing) leading to a CDP interval of 25
m using 5 ms sampling rate. Moreover, a fixed spread consisting of
90 3-component seismometers was deployed as a piggy-back along the
100 km profile to record all near-vertical sources during the entire
NVR survey yielding additonal velocity information. The processing
of the vibroseis data set (total about 17.200 single records) up
to the CDP stack shows some clear crustal reflectors as well as the
Moho at about 11 sec TWT. These results will be presented and discussed
in their relationship to the other subprojects of DESERT 2000 in
order to improve the understanding of the geodynamic evolution of
the Dead Sea Transform and related crustal structures.