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RE: earthquake intensity classification

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New Zealand defines the "design" earthquake as that for the 450 year return
period, 10% probability of exceedence in a 50 year nominal building design
life.  This equates to about MM8.5 to MM9.0 or 0.35+/- PGA in the most
seismically active regions.

For retrofit of unreinforced masonry buildings the trigger level is that for
a moderate earthquake defined as one having a 150 year return period, 30%
probability in 50 years, MM7.5 or thereabouts, PGA 0.15+/- where most
seismically active.

The above figures are rounded.  The 'decimal' MMI values are for convenience
in the interger scale.  Data scatter results in wide band interpolation of
values.  These figures indicate the general idea.

--------------------------------------------
Bruce Shephard
Principal Consultant (Seismic Risk)
Opus International Consultants Ltd
P O Box 12,003
Majestic Centre, 100 Willis Street, WELLINGTON, NEW ZEALAND
E-mail: bruce.shephard(--nospam--at)opus.co.nz
Telephone: +64 4 4717597 Bus,
           +64 4 5863652 Res.
Facsimile: +64 4 4711397
--------------------------------------------

> -----Original Message-----
> From: 9424163 Á¤¼®Ã¢ [mailto:jeong(--nospam--at)mail.dwconst.co.kr]
> Sent: Monday, 16 November 1998 22:39
> To: seaint(--nospam--at)seaint.org
> Subject: earthquake intensity classification
>
>
> Japanese Building Standard Law(BSL) classify earthquakes intensity as
> follows.
>
> 1) moderate earthquake shaking: 0.07g-0.10g(PGA)
>
> 2) severe earthquake shaking: 0.34g-0.4g(PGA)
>
>
> How about other countries?
>
> USA has a classification of earthquake intensity?
>
>
> Thanks in advance
>
>