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               The Nicaraguan Seismic Network located in July, 1997, a number of 179  seismic events. The mayority of them were located in the subduction zone off coast of the Pacific Ocean. Seismic events occurred in the volcanoes San Cristóbal, Telica, Cerro Negro, Momotombo, Apoyeque, Laguna de Apoyo.

               A swarm of seismic events that occurred near Apoyeque volcano was felt widely in Managua area with maximum intensities of V in the epicentral area.

               Another swarm activity occurred near volcanoes Cerro Negro and El Hoyo.

                San Cristóbal volcano continued with its low intensity eruption, with small excplosions in the crater and emission of low amounts af ash.

                At Telica volcano the  high level of seismic activity continued without visible signs of other volcanic activity in the crater.

               The big earthquake that occurred in Venezuela on July 9, was recorded by the Nicaraguan Seismic Network.


               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).