Seismic Data Acquisition
Seismic Data Acquisition : All but the simplest seismic instruments are designed to record the time history of ground motion. For discussing such instruments, it is useful to break diem down into three parts (although these may be combined in an actual instrument). First there is a sensor, which converts ground motion into some other quantity, usually an electrical one; this sensor is called a seismometer, or a geophone in exploration seismology. Next, the sensor output is modified, usually by amplifying some frequencies and suppressing others; very often such modification is done partly within the sensor itself. Third, the modified output is recorded, along with a time scale (and in most cases absolute time). With the growth, first of analog and then of digital electronics, the systems used for the signal modification and recording have increasingly often been adapted from devices built for other purposes, rather than being purely seismological inventions. It is with such seismic instrumentation that seismic data is aquired, with the exception of other types of seismic data, for example data for earthquake intensity determinations, or other field data, which is acquired by surveys
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