Embedded in the discussion is the point about the M7.3 landers "triggering" quakes 1250 km away and the mechanism being "unknown".

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The Indian and Pakastani test sites are approximately 1000 km from the recent Afghanistan earthquake epicenter. The question that has been asked is whether or not the occurrence of these nuclear tests influenced the occurrence of the large earthquake in Afghanistan. The most direct cause-effect relationship is that the passage of the seismic waves, generated by the thermonuclear explosion, through the epicentral region in Afghanistan somehow triggered the earthquake. For example, following the occurrence of the magnitude 7.3 Landers earthquake in southern California on June 28, 1992, the rate of seismicity in several seismically active regions in the western US, as far as 1250 km from the epicenter, abruptly increased coincident with the passage of the earthquake generated seismic wavefield through each site. The abrupt increases in seismicity occurred primarily in regions of geothermal activity and recent volcanism.

==> The mechanism by which this occurred remains unknown.

The Afghanistan earthquake occurred at 06:22:28 UT on May 30, 1998 and the thermonuclear test most closely associated in time occurred at 06:55 UT or after the occurrence of the earthquake. The other nuclear tests occurred 2-20 days before the earthquake.

See the link.

• Can nuclear explosions cause earthquakes?