By W.H.K. Lee and S.W. Stewart (Eds.)
ISBN-10: 0120188627
ISBN-13: 9780120188628
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Extra resources for Principles and Applications of Microearthquake Networks
Example text
On the other hand, a large computer may have a data capacity of I@* bits, a data rate of lo7 bitdsec, and an execution speed of lo7 instructions per second. Data processing requires at least several computer instructions for each data sample, and there are about 3 x lo7 seconds in a year. 2. Record Keeping 49 mation. In fact, since most people have a short memory span, we cannot assimilate more than about 10s bits (or 50 pages) of new information at any given time. This simple analysis suggests that for any given scientific observation, we should collect less than loL3 bits/year of raw data in order not to exceed the capabilities of our present computers.
A number usually takes from 10 to 60 bits depending on the precision required. A page of a scientific paper contains about 2 x lo4 bits of information, whereas a color picture can require up to lo8bitdframe to display. Thus a picture is generally much higher in information density than a page of words or numbers. For a human being or a data processing device, the limiting factors are data capacity, data rate or execution time, and access delay time. Although human beings may have a large data capacity and quick recall time, they are limited to a reading speed of less than 1000 words/min or lo3bitdsec, and a computing speed of less than one arithmetic operation per second.
Absolute time was determined by recording a few minutes of radio time code at the beginning and end of each seismogram. 2. Semiautomated Methods Several semiautomated methods to detect seismic events have been tried, but the results have not been satisfactory. Nevertheless, we will give two examples here. Seismic data recorded on analog magnetic tapes can be played back fast enough to be audible. Earthquakes can then be detected by hearing changes in the level and pitch of the sound. With a little practice, it is not difficult to detect the onset of earthquakes.
Principles and Applications of Microearthquake Networks by W.H.K. Lee and S.W. Stewart (Eds.)
by Edward
4.2