Computerized seismic prospecting is an echo-ranging technique usually targeted at accurate mapping of oil and gas reservoirs. In seismic surveys an impulsive source, often an explosive charge, located at the earth's surface generates elastic waves which propagate in the subsurface; these waves are scattered by the earth's geological discontinuities back to the surface, where an array of receive...

detection of subsurface structures by means of gravity method can be used to determine mass distribution and density contrast of rock units. this distribution could be detected by different geophysical methods, especially gravity method. however, gravity techniques have some drawbacks and can't be always successful in distinguishing subsurface structures. performance of the gravity technique co...

[1] A recent expedition to the equatorial Pacific surveyed over 60,000 km of seafloor using swath map imaging and high-resolution seismic profiling. This survey revealed the common occurrence of large pits in the biogenic sediments that are usually associated with basement highs. The pits range in size up to a few kilometers across and are on the order of 50 m – 100 m deep. They were found on s...

GeoSAR is a program to develop a dual frequency airborne radar interferometric mapping instrument designed to meet the mapping needs of a variety of users in government and private industry. Program participants are the Jet Propulsion Laboratory (JPL), Calgis, Inc., and the California Department of Conservation with funding provided initially by DARPA and currently by the National Imagery and M...

The February 21, 2008, Wells earthquake (MW=6.0) occurred in a region of northeastern Nevada where the seismicity has historically been low relative to western Nevada. In a region of area of approximately10 5 km 2 of northeastern Nevada, based rates of smaller earthquakes in the region prior to 2008, earthquakes of MW=6.0 or larger are expected with a rate of about 0.01 per year. The probabilit...

It has been proposed that in the case of strong multiple scattering, the data matrix P is replaced by its inverse P−1 before starting seismic processing. In the inverse data space, all surface-related multiples map onto the origin, whereas the inverse of the primaries map mostly at negative times. This interesting property opens up new ways to separate primaries from multiples and apply other p...

Information about reservoir properties usually comes from two sources: seismic data and well logs. The former provide an indirect, low resolution image of rock velocity and density. The latter provide direct, high resolution (but laterally sparse) sampling of these and other rock parameters. An important problem in reservoir characterization is how best to combine these data sets, allowing the ...

Seismic hazard and risk are fundamentally different concepts. Seismic hazard describes phenomena generated by earthquakes that have potential to cause harm, but seismic risk is the likelihood (chance) of experiencing a specified level of seismic hazard in a given time exposure. Seismic hazard occurs naturally and can be evaluated from instrumental, historical, and geological observations. Seism...

We present a new 1:25,000-scale geological map of the lower Belice River valley, area struck by M > 5.0 devastating 1968 seismic sequence, whose source and seismotectonic framework are still controversial. The map, utilizing dating methods traditional field survey approaches integrated high-resolution topography, provides an unprecedented detail precision on spatial distribution compressional g...