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I am aware of the extent of the Basin and Range Provence. Triggering of minor earthquakes as a result of major quakes is not unknown, most recently documented after a recent Alaskan quake (with an interesting article on changes in geyser behavior in Yellowstone).

Clusters of small quakes (1-2.5 Richter) were reported following the 9.0 temblor off Sumatra's coast on Boxing Day, peaking at times concordant with the expected arrival times for S, P and Rayleigh waves.

Are you referring to seismograph stations throughout the region. All indeed did record the multiple waves generated Dec 26. If that is what you are talking about, then I fully agree that the earth was ringing like a bell as all the seismic waves bounced throughout the earth.

However, the USGS website does not show the numbers you are inferring and perhaps the arrivals of the Sumatra waves generated initial false readings until reviewed by the seismological staff. Since the sites keep track of epicenters for a period of one week, all these should still be posted. New Mexico is quiet, same for most of Idaho (minus Yellowstone Park area)and northern NV is quiet. The Utah-Montana sub map shows only 3 quakes originating on Dec 26. The S.CA, NV, UT submap shows approximately the same number of posted quakes before and after Dec 26. The current USGS postings do not support these clusterings of 1-2.5 range quakes unless you are refrain to something else not posted on these maps. Please clarify.

Thanks for your patience. I just feel very nervous about posting my own interpretations of station recordings. Fortunately, there is also this post here that addresses the topic:

The quake demonstrated that when hit hard enough, Earth "rings like a bell," according to John Derr, a seismologist with the Geological Survey in Albuquerque.

The frequency at which Earth rings is far lower than any ordinary bell, beyond anything you could hear. But when struck with the force of Sunday's magnitude 9.0 quake, the ringing can last for days.

Located at Kirtland Air Force Base, the Survey's seismometer continued to show weak echoes of the quake Tuesday afternoon in the form of pulses of movement in the Earth's crust every five to six minutes.