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Sensors 2008 , 8
estimate the PGV at the same site. When Pd ≥ 0.5 cm, the event is most likely damaging.
are the two basic parameters used for EEW in this approach.
Wu and Kanamori (2005a, 2005b, 2007), and Wu et al. (2006, 2007) applied this method to EEW in
southern California, Taiwan, and Japan by determining
τ
between
and M
determined from the Japan, Taiwan, and southern California records.
c
w
54 events for which at least four measurements are available for each event are shown in this figure.
The potentially damaging earthquakes with M
both coordinates of M
w
log
10
1
0.1
4
Figure 2. τ
estimates for 54 events using the nearest stations for Japan (black triangles), southern
c
California (red solid circles) and Taiwan (blue diamonds). Symbols show the event-average with
standard deviation. Solid line shows the least squares fit and the two dashed lines show the range of
τ results in relationships
and
c
τ
M
=
. 0
296
−
. 1
462
c
w
τ
M
=
. 3
373
log
+
. 5
w
c
Taiwan 11 events
Southern California 26 events
Japan 17 events
5
one standard deviation.
τ and Pd. Figure 2 shows a good linear trend
c
τ > 1 sec. The regression with errors in
> 6 all have
w
c
±
0
1 .
2 2
and
787
±
. 0
412
log ( τ
) = 0.296 M
c
Sdv=0.122, R=0.933
6
M
w
τ values of
c
- 1.716
w
7
8
5
τ
and Pd
c
(4)
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