Adaptation of the application waspar to new linux distributions

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Time base stability of ocean bottom seismometers (OBS)

During the past decades, Ocean Bottom Seismometers (OBS) have played a key role in permanent seismic activity monitoring at sea as well as allowing a better understating of the earth interior. Data collected by the instrument can provide information on the ocean bottom sub-layers down to a depth of 40 km beneath the ocean floor. The accuracy of the results directly depends on the temperature stability of the crystal used as the main time base of the equipment. This paper presents the study of temperature stability of a Seascan module in real environmental conditions. By means of a climate chamber, temperature tests of a Seascan module were carried out and crystal temperature stability was calculated.Peer ReviewedPostprint (published version

ADC module built for an ocean bottom seismometer (OBS)

This paper presents the new data acquisition system designed for autonomous Ocean Bottom Seismometers (OBS) to study the earth dynamics and internal structure. This part is the responsible to acquire the signals from two different sensors to be processed. The analog-to-digital converter module is based on input amplifiers, modulator and digital filter.Peer ReviewedPostprint (published version

Time base stability of ocean bottom seismometers (OBS)

During the past decades, Ocean Bottom Seismometers (OBS) have played a key role in permanent seismic activity monitoring at sea as well as allowing a better understating of the earth interior. Data collected by the instrument can provide information on the ocean bottom sub-layers down to a depth of 40 km beneath the ocean floor. The accuracy of the results directly depends on the temperature stability of the crystal used as the main time base of the equipment. This paper presents the study of temperature stability of a Seascan module in real environmental conditions. By means of a climate chamber, temperature tests of a Seascan module were carried out and crystal temperature stability was calculated.Peer ReviewedPostprint (published version

Clock synchronization of a broadband seismometer through IEEE-1588 protocol

In seismology, the time of the signal acquisition is highly important in order to know the magnitude and location of the earthquake. This paper presents the tests carried out to synchronize the seismometer clock through the IEEE-1588 protocol.Peer ReviewedPostprint (published version

Clock synchronization of a broadband seismometer through

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Data acquisition system for a clabed ocean bottom seismometer (OBS)

Peer Reviewe

Data acquisition system for a cabled ocean bottom seismometer (OBS)

Ocean Bottom Seismometers (OBS) are highly used to monitor seismic activities at sea. They are also used to detect tsunamis and generate warning alarms. This paper presents a data acquisition system built for an OBS with capability to synchronize time through IEEE-1588 protocol. This acquisition system provides real time data through the Ethernet making it suitable for OBSs deployed at seafloor observatories.Peer ReviewedPostprint (published version

Time synchronization of a commercial seismometer through IEEE-1588

Seismometers use a GPS signal for time synchronization and the seismic data are collected, time marked and stored. The precision of the time marks is a key parameter for the location and magnitude of an earthquake.Land seismometers are implemented with an internal GPS receiver where only an external antenna is needed for time synchronization. This paper presents the implementation of the time synchronization of a land seismometer through the IEEE-1588 protocol.Time synchronization tests have been carried out and results are presented.Peer ReviewedPostprint (published version