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               The Nicaraguan Seismic Network located in May, 1997, a number of 158.  seismic events. The mayority of them were located in the subduction zone off coast of the Pacific Ocean. Seismic events occurred in the volcanoes Telica, Rota, Cerro Negro, Momotombo and Apoyeque.

               Three seismic events were felt in Ocotal and surroundings, Department of Nueva Segovia, Northern Nicaragua - near the border  to Honduras.

                San Cristóbal volcano began with a low intensity eruption with small excplosions in the crater and emission of low amounts af ash in the night between May 19 and 20. The eruption was preceeded byseveral days of  increased seismicity.

                At Telica volcano the  high level of seismic activity continued in April, 1997. A mean number of 160 volcano-seismic events was recorded daily at seismic station TELN  located near the crater. Most events are of volcanic type i.e. have no well defined phases and  relatively low frequencies.

               A strong teleseismic earthquake (epicenter region: Iran, Magnitude 7, more than 2000 deaths)   was recorded by the Nicaraguan Seismic Network on Apri 10, 1997).


               The Nicaraguan Seismic Network counts with 21 telemetric seismic stations. The data are digitally recorded and processed at Managua data center. Any seismic event detected by the data acquisition routine is processed regularly within a short time by the seismologist on duty. In case of a strong event the system emits an acoustic signal and the seismologist determines immediately the parameters of the event and sends within minutes a report to the Nicaraguan authorities and the mass media.

               The Monthly Bulletin is published in the first days of the following month, after having revised the preliminary determinations. It is distributed in Nicaragua to governmental organizations and mass media, in Central America to cooperating institutions in Guatemala, Honduras, Costa Rica, Panamá, furthermore it is sent to several cooperating institutions in South America, North America and Europe. Phase data and waveforms can be obtained writing (see address on first page)  or sending an email to the editor (email wilfried.strauch@gf.ineter.gob.ni).