PGS: DC Clean Rivers Project

The March 19, 2015 meeting of the Potomac Geophysical Society will be held at the Fort Myer Officers’ Club in Arlington, VA ( in the Glassed-in room in the Fife and Drum (main dining room).

Timothy J. King, P.G. AECOM Germantown, Maryland

The DC Clean Rivers Project is an ongoing program being implemented by DC Water to reduce combined sewer overflows into the Anacostia and Potomac Rivers and Rock Creek. The Project involves construction of a series of storage and conveyance tunnels and related infrastructure to capture and subsequently treat combined sewer water from heavy rainfalls to reduce impacts to the region’s waterways.

Mr. King’s presentation will discuss the application of geophysical investigation methods to the planning and design of tunnels, shafts and related infrastructure associated with the project. Investigations have included seismic surveys to assess subsurface stratigraphy and depth to bedrock, borehole geophysical logging to characterize bedrock discontinuities, multichannel analysis of surface waves (MASW) to delineate buried channels, vertical seismic profiling for seismic design, and side-scan sonar surveys to delineate underwater obstructions.


Timothy King is a Principal Geologist at AECOM (formerly Woodward-Clyde Consultants and URS Corporation) in Germantown, Maryland. He built and is the leader of the geophysical services team at URS/AECOM. His experience includes engineering geophysics, engineering geology, and hydrogeology applied to site investigations to evaluate subsurface conditions related to tunnels, mines, highways, bridges, dams, and other civil infrastructure. He has been responsible for technical and management aspects of investigations at hundreds of sites across the United States and has worked on projects in Africa, South America, Europe and New Zealand.

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

Marcia McNutt at UMD

2015 Geology Colloquium Series – Geology Dept., University of Maryland, College Park

Friday, March 6th 2015 at 3:00 pm
in PLS 1140

Marcia McNutt
American Association for the Advancement of Science

Geoscience Problem Solving for Sustainability: Focus on Climate and Energy

Geoscientists are and will continue to be at the forefront of finding solutions to many of the world¹s most pressing challenges for how to find solutions to many of problems in maintaining and enhancing the quality of life for the billions of people on Earth in a sustainable manner. At the center of this challenge is the energy-climate change nexus: how to provide abundant energy to power modern society without continuing to contribute to the risk of climate change. Geoscientists are solving these problems by helping to find energy sources with lower CO2 emissions, providing the science for climate change adaptation, and exploring the prospects for climate intervention. Hand-in-hand with these issues, geoscientists need to be cognizant of the continuing need for abundant critical materials and water for alternative energy technologies and energy production.

PSW: Our Lost World

The Paleontological Society of Washington

Our Lost World:

The causes and consequences of the loss of >200 million mammals at the terminal Pleistocene

S. Kathleen Lyons

Department of Paleobiology, National Museum of Natural History, Smithsonian, Washington D.C. 20013

Wednesday, March 18, 7:00 pm, in the Cooper room (E-207A), National Museum of Natural History, Constitutional Ave. entrance

Non-Smithsonian visitors will be escorted to the Cooper Room at 6:30 and 6:55 p.m. Society members will host the speaker for dinner at the Elephant & Castle (1201 Pennsylvania Ave.) prior to the meeting. Members may meet at the restaurant or inside the Constitutional Ave. entrance of the NMNH at 5:00 and walk to the restaurant as a group.

51st Annual GLMSMC Gem, Mineral and Fossil Show

Gem, Lapidary, and Mineral Society of Montgomery County MD., Inc.

51st Annual GLMSMC Gem, Mineral and Fossil Show

At the Montgomery County Fairgrounds – Maryland

March 21 & 22, 2015.

Montgomery County Fairgrounds –

16 Chestnut Street, Gaithersburg, Maryland 20877

Saturday 10:00 A.M. to 6:00 P.M.

Sunday 11:00 A.M. to 5:00 P.M

Admission is $6.00, ages 12 and older.
Admission is Free for Children (11 and under), Free for Scouts in Uniform.

To get a $1 off coupon please go to the club website:

Plenty of Free parking for the show

More than 20 dealers will have gems, minerals, fossils, meteorites and crystals for sale. Enjoy demonstrations, over 40 exhibits, raffle, door prizes, free workshop, free specimens for kids, and/or get more information about specimens from your own collection. Those under 18 can dig for free specimens in the kid’s mini-mines!

Plans are to have set up again – the Youth Earth Science Education Area (great for Cub Scouts to work on their Belt loop and Webelos Academic pin!)

The Gem, Lapidary, and Mineral Society of Montgomery County, is a long standing non-profit organization that was formed to provide all persons interested in Earth Science (Geology, Mineralogy, & Paleontology) and Lapidary Arts the opportunity to increase their knowledge and broaden their interests through a variety of learning and collecting activities.

The club holds regular monthly meetings (2nd Monday of the month) (except July and August), sponsors presentations and organizes collecting field trips in additional to holding an annual show.

Mendenhall seminar @ USGS: Quakes on Wasatch Fault

Mendenhall Postdoctoral Research Seminar

Scott Bennett, USGS – Golden, CO

When: Wednesday, March 4, 2015 – 12 Noon

Where: Via WebEx and National Center, Room 1C400 (Visitor Center)


How Big and How Frequent Are Earthquakes on the Wasatch Fault in Utah? Using Paleoseismology and Lidar to Evaluate Earthquake Rupture Patterns

The 350-km-long Wasatch fault zone (WFZ) consists of ten west-dipping normal fault segments at the eastern boundary of the Basin and Range Province, Utah. Fresh fault scarps at the foot of the Wasatch Mountains indicate that large earthquakes have recently occurred on the WFZ, as first documented by G.K. Gilbert in the 1880s. The most recent earthquake predates written records and European settlement in the 1840s, leaving paleoseismologists to the tasks of determining the size and frequency of past earthquakes and estimating the current seismic hazard. Over three decades of paleoseismic trench research having produced abundant earthquake timing data along the central WFZ. These data have been interpreted as evidence for ruptures during large (M≥7.0) Holocene (<11 ka) earthquakes that were restricted to a single fault segment. However, uncertainties in earthquake timing permit earthquake correlations that allow for longer ruptures that spanned segment boundaries. To improve rupture length estimates and evaluate the persistence of Holocene rupture termination at central WFZ segment boundaries, a collaborative team from the USGS and the Utah Geological Survey conducted four paleoseismic trench studies near these boundaries. Data from paleoseismic trenches constrain the timing and surface displacement of Holocene earthquakes and, when integrated with results from adjacent trenches, provide new constraints on surface rupture length and earthquake magnitude. We have also analyzed new high-resolution (8 pts/m2) airborne lidar data along the central WFZ, which provide unprecedented elevation information for lake shoreline features associated with late Pleistocene Lake Bonneville. These faulted shoreline features serve as strain markers across the WFZ, permitting precise fault offset estimates near WFZ segment boundaries for the past ~10­–20 kyr. I will summarize paleoseismic and geomorphic constraints on the extent of recent surface-rupturing earthquakes and evidence for non-persistent rupture terminations at segment boundaries along the central Wasatch fault zone. These findings will permit a more accurate characterization of the earthquake hazard in the Wasatch Front region.

WebEX Info

Topic: (20) Mendenhall Seminar: Scott Bennett
Date: Wednesday, March 4, 2015
Time: 12:00 pm, Eastern Standard Time (New York, GMT-05:00)
Meeting number: 711 911 008
Meeting password: (This meeting does not require a password.)
Host Key: 819057

Click the following link to view or edit your meeting information, or to start your meeting.

Teleconference: National Center in Reston, VA Dial In: x4848
DOI Dial In Number: 703-648-4848
Non-DOI Toll Free Dial In Number: 1-855-547-8255*
Security Code: 91930 followed by the # sign

Karst Waters Institute Award Dinner

Karst Waters Institute Award Dinner Announcement

The 2015 Karst Award honoree is Dr. David C. Culver.  Dr. Culver will speak on the topic of “Why Study Cave Life?”

Saturday, March 14, 2015, 6‐9 PM

Dos Tequilas Grill, 525 East Market Street, Leesburg, VA

In addition to Dr. Culver’s presentation, other awards will be given, including the William Wilson Scholarship.

Dinner will cost $60 per person and includes hors d’oeuvres, dinner with choice of entree, & basic beverages. A cash bar option for other drinks will be available.

Reserve your seat(s) by EITHER

(1) sending a check for $60 per person to Karst Waters Institute, PO Box 4142, Leesburg, VA 20177 or

(2) using the link at  to make a payment of $62.10.

Reservations must be received by March 6.

OSB Revelle lecture: “Overturning assumptions”

Roger Revelle Commemorative Lecture

Save the Date: March 4, 2015, 5:30 PM

Reception to Follow

Overturning Assumptions:

Past, present, and future concerns about the ocean’s circulation

You are cordially invited to join the National Research Council’s Ocean Studies Board for the Sixteenth Annual Roger Revelle Commemorative Lecture.  The Revelle Lecture was created by the Ocean Studies Board in honor of Dr. Revelle’s contributions to the ocean sciences and his dedication to making scientific knowledge available to policymakers.  The 2015 speaker is Dr. Susan Lozier, Ronie-Richelle Garcia-Johnson Professor of Earth and Ocean Sciences at Duke University.

This year the lecture, Overturning Assumptions: Past, present, and future concerns about the ocean’s circulation, will examine the crucial role that ocean circulation plays in the Earth’s climate system by sequestering anthropogenic carbon dioxide and heat in the deep ocean. New research is uncovering the mechanisms that control the overturning strength and how it may change in the decades ahead. As the pieces are coming together, some long-held assumptions have been overturned and some new paradigms are surfacing.

The lecture is free and open to the public

Wednesday, March 4, 2015 at 5:30 pm

Reception to follow

Baird Auditorium in the Smithsonian’s National Museum of Natural History

Enter at 10th Street and Constitution Avenue