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               The Nicaraguan Seismic Network located in June, 1997, a number of 155  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 and in Laguna de Apoyo.

               Several  seismic events were felt by the population of Granada city and surroundings. These events had their origin in the vicinity of Laguna de Apoyo.

               On seismic event was  felt by the population in the North region of Nicaragua: Ocotal, Macuelizo, Dipilto y Dipilto Viejo. The epicenter was very near the village of Dipilto.

               A rather strong seismic event (M=6.4) occurred in Eastern Costa Rica and was felt by the population of Bluefields, El Rama, Corn Island, San Juan del Sur.

                San Cristóbal volcano continued with his eruption which began in the month before. The seismic tremor caused by explosions in the crater and degassing maintained its high level. Still there occurred no important negative effects to the population. Ash fall was detected only very near the volcano. 

                At Telica volcano the  high level of seismic activity with a sight tendency of increasing RSAM (seismic amplitudes) values continued in June, 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).