UUSS and University of Utah Seismology at AGU 2016

AGU Fall Meeting 2016 (American Geophysical Union) presentations from UUSS and other University of Utah Seismologists.

Amir Allam

Jamie Farrell

Paul Geimer

Keith Koper

Guanning Pang

Kevin Ward

Sin-Mei Wu

Hao Zhang

 

Origins of a National Seismic System in the United States

Origins of a National Seismic System in the United States

John R. Filson, Walter J. Arabasz

ABSTRACT

This historical review traces the origins of the current national seismic system in the United States, a cooperative effort that unifies national, regional, and local-scale seismic monitoring within the structure of the Advanced National Seismic System (ANSS). The review covers (1) the history and technological evolution of U.S. seismic networks leading up to the 1990s, (2) factors that made the 1960s and 1970s a watershed period for national attention to seismology, earthquake hazards, and seismic monitoring, (3) genesis of the vision of a national seismic system during 1980–1983, (4) obstacles and breakthroughs during 1984–1989, (5) consensus building and convergence during 1990–1992, and finally (6) the twostep realization of a national system during 1993–2000. Particular importance is placed on developments during the period between 1980 and 1993 that culminated in the adoption of a charter for the Council of the National Seismic System (CNSS)—the foundation for the later ANSS. Central to this story is how many individuals worked together toward a common goal of a more rational and sustainable approach to national earthquake monitoring in the United States. The review ends with the emergence of ANSS during 1999 and 2000 and its statutory authorization by Congress in November 2000.

Magnitude 3.2 near Bluffdale, Utah

PRESS RELEASE

University of Utah Seismograph Stations

Released: November 25, 2016 09:45 AM MST
The University of Utah Seismograph Stations reports that a minor
earthquake of magnitude 3.2 occurred at 08:45 AM on November 25, 2016
(MST). The epicenter of the shock was located 6 miles below the
Traverse Mountains at the southern end of the Salt Lake Valley, 4.1 mi
SW of Bluffdale, UT. This earthquake was widely felt in the southern
Salt Lake Valley and northern Utah Valley. The largest earthquake
previously recorded in this area was a magnitude 4.1 event on March 16,
1992.

Anyone who felt the earthquake is encouraged to fill out a survey form
either on the Seismograph Stations website: www.quake.utah.edu or the
US Geological Survey website: earthquake.usgs.gov.
Earthquake Summary:
Date (UTC): November 25, 2016 Time (UTC): 15:45

Date (local): November 25, 2016 Time (local): 08:45 AM MST

Latitude: 40 27.17′ N

Longitude: 111 59.83′ W

Preferred magnitude: 3.20 Ml

Salt Lake City’s Fix the Bricks Program

Fix the Bricks is Salt lake City’s plan to help homeowners afford seismic improvments to homes.

Unreinforced masonry buildings and homes (URMs) create the greatest risk for the Salt Lake Valley in the expected Utah earthquake. Fix the Bricks, facilitates seismic improvements to URMs to save lives. Preparedness starts at home, Act Now! Determine if your home is at risk and register to receive more information about how to get started including financial incentives available for making seismic improvement.

RIGHT NOW YOU CAN APPLY FOR A GRANT TO RECEIVE UP TO 75% OF YOUR SEISMIC RETROFIT COST.

Sign up at www.bereadyslc.com/go/doc/6354/2122438/

KSL.com story

Dr. Bob Smith’s interview on NPR’s Hear & Now

Here & Now’s Jeremy Hobson takes a tour of Yellowstone National Park’s geyser basin with a park ranger and a scientist who’s been studying the geology of the park for nearly 60 years.

Yellowstone is home to more geysers than any place on Earth, and researchers are still learning about how they work.

Guests

Dr. Bob Smith, coordinating scientist at the Yellowstone Volcano Observatory and an emeritus professor of geophysics at the University of Utah.

Rebecca Roland, park ranger at Yellowstone National Park.

 

Mag 3.5 near Granger, Wyoming

PRESS RELEASE
University of Utah Seismograph Stations
Released: July 02, 2016 05:54 PM MDT
The University of Utah Seismograph Stations reports that a minor
earthquake of magnitude 3.5 occurred at 04:14 PM on July 02, 2016
(MDT).  The epicenter of the shock was located in southwest Wyoming,
5 miles NNE of the town of Granger, WY and 26.3 miles W of Green River,
WY.  Twenty-two earthquakes of magnitude 3.0 or greater have occurred
within 25 km of the epicenter of this event since 1962.
Anyone who felt the earthquake is encouraged to fill out a survey form
either on the Seismograph Stations website: www.quake.utah.edu or the
US Geological Survey website: earthquake.usgs.gov.
Date (UTC):   July 02, 2016         Time (UTC):   22:14
Date (local): July 02, 2016         Time (local): 04:14 PM MDT
Latitude:     41 39.83′ N
Longitude:    109 56.40′ W
Preferred magnitude: 3.5 Ml

A uniform moment magnitude earthquake catalog and background seismicity rates for the Wasatch Front and surrounding Utah region: Appendix E in Working Group on Utah Earthquake Probabilities (WGUEP)

Arabasz, W.J., Pechmann, J.C., and Burlacu, R., 2016, A uniform moment magnitude earthquake catalog and background seismicity rates for the Wasatch Front and surrounding Utah region: Appendix E in Working Group on Utah Earthquake Probabilities (WGUEP), 2016, Earthquake probabilities for the Wasatch Front region in Utah, Idaho, and Wyoming: Utah Geological Survey Miscellaneous Publication 16-3, variously paginated.

This appendix to the report by the Working Group on Utah Earthquake Probabilities (2016) describes full details of the construction and analysis of a refined earthquake catalog and the calculation of seismicity rates for the Wasatch Front and surrounding Utah region. The earthquake catalog covers the period from 1850 through September 2012. The catalog region extends from lat. 36.75° to 42.50° N and from 108.75° to 114.25° W. A uniform moment magnitude, M (and quantified magnitude uncertainty), is determined for each earthquake in the catalog.


Electronic Supplements (.xlsx)

E-1.  Best-Estimate Moment Magnitude (BEM) Earthquake Catalog

E-2.  Moment Magnitude Data

E-3.  Merged Subcatalog A, Jan. 1850-June 1962

E-4.  Merged Subcatalog B, July 1962-Dec. 1986

E-5.  Merged Subcatalog C, Jan. 1987-Sept. 2012

E-6.  Worksheets for Mobs, M~, Mpred (I0)

E-7.  Worksheets for Xnon, Xmix (Subcatalogs A, B)

E-8.  Worksheets for Xvar, Xi (Subcatalog B)

E-9.  Worksheets for Xvar, Xi (Subcatalog C)

E-10.  N* Counts for the WGUEP and Utah Regions

Earthquake Probabilities for the Wasatch Front region in Utah, Idaho, and Wyoming

Wong, I., W. Lund, C. DuRoss, P. Thomas, W. Arabasz, A. Crone, M. Hylland, N. Luco, S. Olig, J. Pechmann, S. Personius, M. Petersen, D. Schwartz, R. Smith, and S. Bowman (2016). Earthquake Probabilities for the Wasatch Front region in Utah, Idaho, and Wyoming, Utah Geological Survey Miscellaneous Publication 16-3,  418 pp.

Mag 4.1 near Strawberry Reservoir, Utah

PRESS RELEASE 

University of Utah Seismograph Stations

Released: May 25, 2016 7:45 AM MDT

The University of Utah Seismograph Stations reports that a light earthquake of magnitude 4.1 occurred at 07:01 AM on May 25, 2016 (MDT).  The epicenter of the shock was located in the southern Uinta Mountains, 8 miles NE of the town of Hanna, Utah, and 26 miles NW of Duchesne, Utah.  Seven earthquakes of magnitude 3.0 or greater have occurred within 16 miles of the epicenter of this event since 1962.  The largest of these events was a magnitude 4.5 on September 30, 1977, 21 mi NNW of Duchesne.

Anyone who felt the earthquake is encouraged to fill out a survey form either on the Seismograph Stations website: www.quake.utah.edu or the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC):   May 25, 2016         Time (UTC):   13:01

Date (local): May 25, 2016         Time (local): 07:01 AM MDT

Latitude:     40 29.18′ N

Longitude:    110 38.85′ W

Preferred magnitude: 4.1 Ml


Map of May 25 earthquake near Hanna, UT

UUSS 2015 Annual Report

UUSS Annual Report 2015

2015 Annual Report

2015 has been another vibrant and productive year for the University of Utah Seismograph Stations (UUSS). Our longstanding partnership with the United States Geological Survey (USGS) was extended with a new, 5-yr cooperative agreement from the USGS Earthquake Hazards Program. This award ensures that earthquake monitoring in Utah will continue to operate with state-of-the-art equipment and software at least through 2020. Congratulations to the UUSS staff for all their hard work on the USGS proposal, it was truly a team effort.

The legacy of UUSS in earthquake monitoring and research was recognized in 2015 as two former UUSS Directors received prestigious awards for career accomplishments. Research Professor Emeritus Dr. Walter J. Arabasz received the 2015 Alfred E. Alquist Special Recognition Medal from the Earthquake Engineering Research Institute, while Professor Emeritus Dr. Robert B. Smith received the 2015 Paul G. Silver Award from the American Geophysical Union. Congratulations to Walter and Bob for the leadership and service they have provided to the seismological community over the last several decades.

UUSS developed a new monitoring capability in 2015 with the acquisition of nearly 50 new wireless seismographs. The instruments were purchased in collaboration with Dr. Fan-Chi Lin and other University of Utah geoscientists, and will allow for the imaging of shallow Earth structure at a very small scale as well as the detection of small aftershocks that follow regional earthquakes. Please look inside to read about one of the first experiments carried out with the new instruments.

We expect great new things in 2016 as well. Keep an eye out for an updated UUSS web page and expanded social media presence. We also look forward to a celebration of the 50th anniversary of UUSS, in April 2016.