PGS: Rupture process of great earthquakes

The December  meeting of the Potomac Geophysical Society will be held December 15th at the Fort Myer Officers’ Club in Arlington, VA ( in the Glassed-in room in the Fife and Drum (main dining room).

This month’s talk will be: “Rupture process of great earthquakes based on seismic, hydroacoustic, and tsunami data,”  by David Salzberg


Over the last 20 year, the quality and volume earthquake related geophysical data has improved dramatically. Today, there is a global network of broad-band high dynamic range seismic sensors that transmit data in near real time. In addition, in support of the CTBT, a network of hydro acoustic arrays has been deployed in every ocean basin. The global positioning system provides real estimation of location movements with sub centimeter accuracy. Finally, to support tsunami warning, NOAA has deployed a network of deep-water buoys that measure the water depth as a tsunami passes to millimeter accuracy. Coincidentally, since December 26, 2004, five of the 16 biggest earthquakes have occurred, all in coastal regions. Fusing the data from the recent earthquakes has provided insight into the rupture process of these great earthquakes.

New Meeting Room and Dining Arrangements: We now meet in the glassed-in room at the back of the main dining room—The Fife and Drum. We order individually from the Club menu, which has a nice variety of dinner offerings. We pay a single bill (I pay it with my Officers Club credit card), so we collect at least $25 from each diner with the agreement, that if one orders more than $20 in food and drink, he adds the amount over $20 to his contribution. The $5 overcharge goes to the Room Fee, Tax, Gratuity, and the Speaker’s Dinner. We collect on the Honor System. We did this for the first time in September, and it worked well. This room change and use of the menu have greatly reduced the loss that we have incurred in the past for having fewer than 20 people dining, and the change has preserved the viability of using the Officers Club for our meetings.

Reception at 6:00. Order Dinner at 7:00. Talk at 8:30 PM. Please note that the meal orders will be taken at 7:00. Allow 15 minutes for security entering Ft. Myer as all civilian vehicles are searched. To ensure access to and from Fort Myer use the Hatfield Gate, open 24 hours a day ( Reservations are not necessary, however, we need a head count, so, if you wish to attend dinner ($25), please inform Bob Fraser at 540-888-3001 or via E-mail at If you wish, please feel free to attend the talk without dinner. Non-members and guests are welcome. Visit the PGS web site at for new meeting announcements, etc. Please send changes of address or email to


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