Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1; p. 80-89; DOI: 10.1785/0120050029
© 2006 Seismological Society of America
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On the Role of Multiple Interactions in Remote Aftershock Triggering: The Landers and the Hector Mine Case Studies

A. Ziv1

1 Ben-Gurion University of the Negev
Department of Geological and Environmental Sciences
Beer-Sheva, 84105, Israel
zival{at}bgu.ac.il


Figure 001
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  		Figure 1. Maps of earthquake rate change following the Landers earthquake (a) and the Hector Mine earthquake (b). The quantity that is mapped is <{Delta}N> in equation (1) that is calculated for nonoverlapping spatial windows with dimensions of 0.5 x 0.5 deg. The time windows are {Delta}tpost = 10 days, {Delta}tpre = 100 days, and {Delta}tlt is between January 1985 and January 2002. The stars indicate the epicenters of the Landers and the Hector Mine earthquakes. Aftershock activities are examined in four regions that are indicated by solid rectangles and are labeled as North1, North2, LVC, and South.

 

Figure 002
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  		Figure 2. Histograms of event counts as a function of time with respect to (a–d) Landers and (e–h) Hector Mine origin times. A vertical line indicates the time of the mainshock in question. The width of the time bins is 10 days.

 

Figure 003
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  		Figure 3. Plots of cumulative earthquake counts as a function of time. Cutoff magnitude is 2. The mainshocks and the studied areas are indicated in each panel. Dashed lines are best fits to equation (3). The dotted line in (a) is the best fit to the first 60 days.

 

Figure 004
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  		Figure 4. Mainshock indexes, {lambda}, as a function of event magnitude for earthquakes that occurred during the 100 days after the Landers earthquake within regions North1 (a) and North2 (b).

 

Figure 005
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  		Figure 5. Percentage of {lambda} > 1 as a function of the threshold magnitude for earthquakes that occurred during the 100 days after the Landers earthquake within regions North1 (a) and North2 (b). Dashed and solid curves are for earthquakes with {Delta}t > 0 and {Delta}t > 1 day, respectively.

 

Figure 006
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  		Figure 6. Percentage of {lambda} > {lambda}th (p = 1) as a function of the threshold magnitude for earthquakes that occurred during the 100 days after the Landers earthquake within regions North1 (solid) and North2 (dashed). Earthquakes that occurred during the first 24 hr were excluded from this analysis.

 

Figure 007
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  		Figure 7. Percentage of {lambda} > 1 as a function of the threshold magnitude for earthquakes that occurred during the 10 days after the Hector Mine earthquake within region South.

 

Figure 008
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  		Figure 8. Time-space diagram for the Hector Mine aftershocks in area South. The size of the circles is proportional to the earthquake magnitude. The vertical dashed lines indicate the timing of the three largest earthquakes.

 

Figure 009
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  		Figure A1. A histograms showing the distributions of percentage of {lambda} > 1 for aftershocks with magnitude greater than 3(a) and 4(b), calculated for 1000 synthetic catalogs. The dashed lines indicate the observed fraction of {lambda} > 1. The synthetic catalogs were produced by shuffling the times in the original catalog.

 




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