Geophysical Survey

About: Geophysical Survey is a facility organization based out in Obninsk, Russia. It is known for research contribution in the topics: Geology & Fault (geology). The organization has 308 authors who have published 256 publications receiving 3067 citations. The organization is also known as: Federal State Institution of Science Geophysical Survey of the Siberian Branch of the Russian Academy of Sciences.

Adjustment of gravity meter observations

Abstract: From a set of observations made with one or more gravity meters, the mean value of gravity at each observation station, and the drift rate and a linear correction to the calibration of each gravity meter, are derived simultaneously by a least squares procedure By a suitable partitioning, the normal equation matrix can be inverted using a minimum number of computer storage locations

Automatic data capture technology to enhance data collection

Abstract: Method, apparatus and system for determining accurately at least one coordinate of a sensor (or a transducer including a sensor) relative to a predetermined reference location, particularly where the sensor is part of a transducer for ground penetrating radar. A marker detector is positioned in a predetermined relationship with the sensor; a marker is detected with the marker detector and positional information associated with the marker is received, from which a position of the transducer or sensor is determined, based on the received positional information associated with the marker and the predetermined relationship between the marker detector and the sensor. The marker may, for example, be a bar code and the marker detector may be an optical scanner. The sensor may be a receiving antenna for a GPR signal.

Seismological studies of the Raoul Island eruption, 1964

Abstract: An eruption of mud and steam at Raoul Island on 1964 November 20, was preceded by a swarm of earthquakes, which started on November 10. Within four hours of the start of the swarm, the frequency of shocks recorded on the island's seismograph had risen to a maximum of over 80 an hour. Volcanic tremor soon appeared, and became continuous by November 12, masking all but the largest earthquakes. Thereafter, both the level of tremor and the frequency of earthquakes declined until by the time of the eruption only 10–15 shocks an hour were being recorded. Following the eruption, the island was evacuated for two weeks. For four days after the reoccupation on December 6, three additional seismographs were installed and during this time the earthquakes occurred to the west and south-west of the crater, at distances of 4–8 km from it, and at depths of up to 8 km. The amplitude-frequency relationship does not show such a high proportion of smaller earthquakes as has been reported for some other volcanic swar...