Hi Chris. I get the Physics Today journal and I’m also an on line subscriber, but unfortunately one of the stipulations is that I can’t reprint or distribute any of the data without permission and, or paying a fee to do so.

One thing I can do and have done is to check the number of quakes in the Long Valley caldera after the Hector Mine quake. I used the NCSN catalog for this search with a 16Km radius from 37.6125/-118.8513 although 37.6453/-119.0217 may have been a better choice, as it appears to be closer to the center of the activity.

The Hector Mine quake occurred at 0246hrs on 16 Oct. 1999. There was a marked increase in quake activity at Long Valley starting at 0331hrs on 16 Oct.1999 for a total of 38 quakes for that day. The interesting thing about this is that 21 of those quakes occurred in a 20-minute period starting at 1026hrs and ending at 1046hrs on 16 Oct.1999.

There was also a slight increase in dilational strain and long base tilt during this time.

It is my understanding that there was an even greater amount of dilational strain and long base seen after the Landers quake of 1992 and that the increase in quake activity was greater then what was seen with the Hector Mine quake. Not sure as to why the difference, but could be due to the direction the energy propagated, or the Landers quake was a little closer to Long Valley then the Hector Mine quake.

Most of the quakes appear to have occurred near the south moat inside the caldera, but can’t be sure of this. Anyway on the surface there does appear to be a cause and affect. There still needs to be a lot of research done. Take Care…Don in creepy town