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Abstract

 

The Nicaraguan Seismic Network registered in March, 1997, a number of 153 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 and Momotombo.

 

At Telica volcano the previously high level of seismic activity continued in March, 1997. A mean number of 160 volcano-seismic events was recorded daily at seismic station TELN located near the crater. The events have frequencies between 2 and 5 Hz their waveforms indicate volcanic origin, possibly are they caused by degassing in the crater or in conduits of the volcanic system. A monochromatic tremor with a frecuency of 8 Hz is observed nearly continuously. The crater walls are collapsing and some seismic events might be related this process.

 

An swarm of seismic events near Rota volcano was observed on 12 of March.

 

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 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).