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The Nicaraguan Seismic Network registered in January, 1997, a number of 166 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, Cerro Negro, Rota and Maderas.  A swarm activity was detected during the first days of the month in the northwest of the country, in the area of the river Estero Real. A seismic event was located in the central part of the Atlantic Region of the country.


At Telica volcano the previously high level of seismic activity still increased in January, 1997. A mean number of 250 volcano-seismic events was recorded daily at seismic station TELN  localized near the crater. The events have frequencies between 4 and 8 Hz and their waveforms indicate volcanic origin, possibly are they caused by degassing in the crater or in the conduits of the volcanic system. A similar activity was observed in the beginning of 1994 before the small phreato-magmatic eruption in July of this year.


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 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 or sending an email to the editor (ineter@ibw.com.ni - wilfried.strauch@gf.ineter.gob.ni).