Erratum
for
Calderoni et al., BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 95 (6) 2342-2363.
Bulletin of the Seismological Society of America; June 2006; v. 96; no. 3;
p. 1199; DOI: 10.1785/0120060046
© 2006 Seismological Society of America
Assessment of Ground Motion in Palermo, Italy, during the 6 September 2002 Mw 5.9 Earthquake Using Source Scaling Law
Giovanna Calderoni1,
Antonio Rovelli1,
Giovanna Cultrera1,
Riccardo M. Azzara1 and
Giuseppe Di Giulio1
1 Istituto Nazionale di Geofisica e
Vulcanologia
Via di Vigna Murata 605
00143 Rome, Italy
In
Calderoni et al., 2005,
a section of text that was present in the original manuscript was inadvertently
deleted during composition. The section entitled "Random Summation of
Aftershocks (RNDS)" is printed correctly below.
 |
Random Summation of Aftershocks (RNDS)
|
|---|
RNDS
(Joyner and Boore, 1986)
generates synthetic seismograms of the target earthquake at a generic station
(STAT) through the following equation:
| (13) |
where 
is the
ground-velocity time history of a colocated subevent recorded at the same
station. Time histories were preprocessed similarly to the ESR technique and
randomly added with a shift time 
j uniformly
distributed between 0 and source duration T. According to
Joyner and Boore (1986), the
scaling factor w and the total number N in summation (13) are
obtained through the ratios of the seismic moments of the two events
| (14) |
| (15) |
under the assumption of an omega-square model with constant stress drop. The
value of the mainshock duration T was fixed at 5 sec.
We tested the prediction suitability of this method by comparing the
mainshock recording of TORT with simulations derived through (13) using the same
aftershocks (nos. 96, 97, and 113) selected in the test of the preceding method.
Figure 10a indicates that for events 96 and 97 the synthetic waveforms reproduce
the real recordings with a satisfactory agreement in terms of amplitude and
durations. Event 113 underestimates amplitudes by a factor of 2, approximately,
which is still acceptable in the practice of ground-motion prediction.
Manuscript received March 3, 2006
|
References
|
|---|
Calderoni, G., A. Rovelli, G. Cultrera, R. M. Azzara, and G. Di Giulio
(2005). Assessment of ground motion in Palermo, Italy, during the
6 September 2002 Mw 5.9 earthquake using source scaling
law, Bull. Seism. Soc. Am.95
,2342
–2363.[Abstract/Free Full Text]
Joyner, W. B., and D. M. Boore (1986). On simulating
large earthquakes by Green’s function addition of smaller earthquakes, in
Earthquake Source Mechanics,
S. Das, J. Boatwright, and C. H. Sholtz (Editors), American Geophysical
Monograph 37,269
–274.
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References
