Seismic Hazards -- Maps, Probabilities, and EQ Engineering
What is seismic hazard? What is a seismic hazard map? How are they made? How are they used? Why are there different maps, and which one should I use?
Seismic hazard is the hazard associated with potential earthquakes in a particular area, and a seismic hazard map shows the relative hazards in different areas.
Where can I find seismic zone maps with 0, 1, 2, 3, 4? What seismic zone is location X in? What is the seismic zone number for Federal site Z?
Building code maps using numbered zones, 0, 1, 2, 3, 4, are practically obsolete. 1969 was the last year such a map was put out by this staff.
Determining your risk with regard to earthquakes, or more precisely shaking from earthquakes, isn't as simple as finding the nearest fault.
Published maps will only provide generalized, uninterpreted information about specific areas.
You should consider the following factors when deciding whether or not to get earthquake insurance:
Try the Multidisciplinary Center for Earthquake Engineering Research website for that information.
Unfortunately, this is almost the same question as "Can you predict earthquakes?" A particular area can be "having a lot of earthquakes" for many different reasons, and we usually cannot tell why.Sometimes there are many earthquakes because they are pa
The National Seismic Hazards Mapping project provides an online web tool for determining the probability of a large earthquake within 50 kilometers (~31 miles) of a specific location over a certain time period.
Within the next 30 years the probability is:
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