Todd,
There have been around 4 papers given at AGU and SSA in the past several years
regarding triggering effects of the San Francisco earthquake throughout the region.
There was a magnitude 6 in Southern California the same day which was probably
felt in L.A.
Don has a link to the latest paper given last week last week at SSA on this triggering
effect. Following is a press release he sent me several days ago:
By the way, windows broke a lot easier in the 1800's than today so don't
read too much into that..

Following the great 1906 San Francisco earthquake, a large number of =
distant aftershocks or triggered earthquakes occurred much farther away =
from the fault than previously realized, according to scientists at the =
U.S. Geological Survey.=20

Speaking at the annual meeting of the Seismological Society of America =
in San Francisco today (4/18/01), Aron Meltzner and David Wald, =
researchers at Caltech and the USGS in Pasadena, said aftershocks which =
took place within the first two days after the San Francisco mainshock, =
rattled areas of southern California, western Arizona, western Nevada =
and south-central Oregon. The largest of these events were a magnitude =
6.1 earthquake near the Salton Sea, in California=92s Imperial Valley, =
and a magnitude 5.0 earthquake under or near Santa Monica Bay.=20

Traditionally, scientists have thought that earthquakes do not trigger =
other earthquakes more than one rupture length away from the fault =
rupture. That is, if the part of the fault that slipped in the 1906 =
earthquake was 250 miles long, the earthquake would not trigger other =
earthquakes more than 250 miles away from that part of the fault. =
However, after the 1992 Landers earthquake triggered earthquakes near =
Mammoth Lakes, California, Yucca Mountain, Nevada, and in Yellowstone =
National Park, the scientific community became more aware of these =
=93distant aftershocks.=94 Looking back in time, Meltzner and Wald =
wanted to see if the same phenomenon took place after 1906.=20

=93What we found,=94 said Meltzner, =93is that earthquakes started =
popping up all over southern California and in Arizona and Oregon that =
were well beyond 250 miles from the fault. That doesn=92t include two =
earthquakes east of Reno, Nevada that were barely within the 250-mile =
radius, and countless others that may have taken place in remote =
locations where no one was around to report them. These distant =
aftershocks started within an hour of the San Francisco earthquake and =
continued for about a day and a half.=94