Seismological Service

Seismological Service


the work of conducting continuous observation of earthquakes and processing materials according to standard programs and methods. Observations are conducted by a network of seismological stations. The chief objective of seismological services is to determine systematically the principal parameters of earthquake foci, including coordinates of the focus, time of occurrence of the shock at the focus, and energy characteristics. Seismograms and initial bulletins from seismological stations provide raw data for correlation.

Seismological services are conducted by agencies in many countries of the world, for example, by the Integrated System for Seismic Observations (ESSN), in the USSR, by the U.S. Geological Survey in the USA, and by the Japan Meteorological Agency (JMA) in Japan. National seismological centers correlate observation data from seismological services in individual countries. Regional seismological services are organized for the detailed study of seismic activity. Current trends in the development of seismological services include the establishment of autonomous, unmanned seismological stations and grouping systems equipped for telemetric data transmission, the recording of data in digital form, and the extensive correlation of data by computer.

International seismological service is provided by the International Seismological Centre in Great Britain, where data from most of the world’s seismological stations are correlated. Raw data on the arrival time and amplitudes of seismic waves are transmitted from the stations to the seismological center in special form. The siesmological data are then processed by computer. As a result, the coordinates of the earthquake focus and the magnitude of the earthquake are systematically determined.

Data from seismological observations are used to study seismicity, the structure of the earth, and processes at the foci of earthquakes.

With the development of knowledge of the structure of the earth, the foci of earthquakes, and methods of evaluating seismic danger, the objectives of seismological services broaden. An example is the introduction of the systematic determination of additional parameters of earthquake foci, such as the mechanism and dimensions of the focus. Future aspects may include statistical generalizations about earthquakes and the compilation of special seismological tables of the characteristics of seismic wave propagation.

Seismological service data are published in Seismologicheskie biulleteni seti opornykh seismicheskikh stantsii SSSR (Seismological Bulletins of the USSR Network of Reference Seismic Stations, since 1962), Zemletriaseniia v SSSR (Earthquakes in the USSR: yearbook, since 1964), Bulletin of the International Seismological Centre (Edinburgh, since 1967), and The Seismological Bulletin of the Japan Meteorological Agency (Tokyo, since 1951).


Mentioned in ?
References in periodicals archive ?
Since the natural disaster, over 1,500 aftershocks have been registered, according to the National Seismological Service.
Both Mexico's National Seismological Service and the US Geological Survey put the quake's magnitude at 7.
The Republican Center of Seismological Service of the National Academy of Sciences of Azerbaijan told Trend that the number of earthquakes occurred in Azerbaijan and adjacent territories has reached 5,779 this year.
According to the US Seismological Service, the first earthquake was magnitude 7.
The initial quake was centred 133 kilometres from the town of Pijijiapan, in the state of Chiapas, and struck at a depth of 58 kilometres under the Pacific Ocean, the Mexican National Seismological Service said.
The European-Mediterranean Seismological Service said the epicenter was in 123 kilometers east of Dushanbe near the construction of the Rogun hydroelectric power plant.
8-magnitude earthquake, local media report, citing the country's seismological service.
The government said that so far there have been 17 aftershocks and there will be more in coming days as some energy from the quake zone has yet to be released, according to Sergio Barrientos of the seismological service at the University of Chile.
21-magnitude, at 9:27 local time (1527 GMT), according to the National Seismological Service - was located in the mountainous area where a September 16 mudslide buried a whole town.
AFP said the quake struck just after midnight local time (0519 GMT), east of the city of Huitzuco, in Guerrero state, at a depth of about 30 miles (50 kilometers), according to Mexico's National Seismological Service and the U.
Later, on September 5th 1910, the National Seismological Service (NSS), an agency of National Geological Institute, was created and installed by presidential decree.
1975, Canadian Earthquakes 1970: Seismological Service of Canada, Seismological Series Number 69, Ottawa, ON.