Latest News from the Nevada Geodetic Laboratory

[June 18, 2018] New paper published on the August 24, 2014 M6.0 South Napa Earthquake

“A new paper published by Nevada Geodetic Laboratory Graduate Student Meredith Kraner uses data from high‐precision continuous GPS stations to observe a 3 mm horizontal expansion of the Earth’s crust prior to and in the vicinity of the August 2014 M6.0 South Napa earthquake. The study is a collaboration with William Holt from Stony Brook University, and Adrian Borsa from Scripps Institution of Oceanography at UC San Diego. The analysis looks at eight years of continuous GPS data leading up to the earthquake and finds that this pattern of horizontal crustal extension repeats every summer. The effect releases pressure on faults in the West Napa fault system, making them more likely to slip during the summer months. We speculate that large seasonal variability in the amount of groundwater in the Sonoma and Napa Valley subbasins may contribute to the observed changes.

Read more in the paper, which has been published in the Journal of Geophysical Research, Solid Earth and is available online here:

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2017JB015420

Also see features from the AGU, AP news, KCBS radio, and Live Science.” (from NGL website)

News from Nevada Today

big%20hill%20seismo%20installation%20dsc_0039
Photo: UNR

Hawthorne, Nev. hit by three magnitude 5.5 to 5.7 earthquakes
by Mike Wolterbeek, Nevada Today, 12/28/16

“Three magnitude 5.5 to 5.7 earthquakes struck about 18 miles southwest of Hawthorne, Nevada just after midnight Wednesday December 28, 2016, the Nevada Seismological Laboratory at the University of Nevada, Reno reported. Reports so far indicate minimal damage due to the remote nature of the earthquake sequence.”

Read more:
http://www.unr.edu/nevada-today/news/2016/hawthorne-earthquakes?utm_source=newsletter122716

 

nevadaradonpotentialmap1180
Photo: UNR


Learn how to reduce the radon health risk
by Tiffany Kozsan, Nevada Today, 12/27/16

“January is National Radon Action Month, and University of Nevada Cooperative Extension’s Radon Education Program is offering free radon test kits and educational presentations at various locations across the state. Free test kits are available at Cooperative Extension offices and partner offices statewide from Jan. 1 through Feb 28, and will also be available at the presentations.”

 Read more:
http://www.unr.edu/nevada-today/news/2016/2017-radon-presentations-and-test-kits?utm_source=newsletter122716

Great Nevada ShakeOut—October 20 at 10:20

image0011

“Millions of people worldwide will practice how to Drop, Cover, and Hold On at 10:20 a.m. on October 20th during Great ShakeOut Earthquake Drills!

Nevadans can join them today by registering for the 2016 Great Nevada ShakeOut. Participating is a great way for your family or organization to be prepared to survive and recover quickly from big earthquakes– wherever you live, work, or travel.”

http://www.shakeout.org/nevada/[shakeout.org]

Also check out the NBMG website for more information on earthquakes:

http://www.nbmg.unr.edu/Geohazards/index.html

http://pubs.nbmg.unr.edu/Living-with-earthquakes-in-NV-p/sp027.htm

The Great Nevada Shakeout 2016

image0011
“The recent earthquakes in Japan and Ecuador have been devastating reminders of how better prepared we can all be. Each year, it is why we join together in ShakeOut – to get ready for the earthquakes in our future. On 10/20 at 10:20 a.m., join your community again and focus on improving your level of preparedness. We are all in this together!”

Get ready to shakeout:
http://shakeout.org/nevada/[shakeout.org]

Nevada Today NSights Blog: Earthquake Economic Resiliency Forum, Tuesday April 19

Nevada Today NSights Blog:
Earthquake Economic Resiliency Forum
Tuesday April 19

Global experts to inform region on economic recovery after devastating earthquakes:
Earthquake Economic Resiliency Forum for public, economic leaders and disaster officials

4/12/2016 | By: Mike Wolterbeek

You can read the story here:

http://www.unr.edu/nevada-today/news/2016/earthquake-economic-resiliency-forum?utm_campaign=nevadatoday

PHOTO CAPTION: The magnitude 6.0 Wells, Nevada, earthquake in 2008 has been the largest seismic event in Nevada in 42 years. Historically, Nevada can expect to have three magnitude 7.0 earthquakes per century and one magnitude 6.0 or larger every decade.

International experts will join with local seismologists in a public forum Tuesday, April 19 to inform the region on the dangers and probabilities of devastating earthquakes, and how to recover economically as a region.

Contrary to the general public perception, the California-Nevada border region is at risk for large, magnitude 7-plus earthquakes striking the greater Reno-Tahoe region. In a magnitude 6 earthquake, according to FEMA estimates, the region could suffer billions of dollars in damage: $1.9 billion in the Reno/Sparks area and $590 million in the Stateline area.

“Considering the unpredictability of large events anywhere in the western U.S., the local earthquake risk and issues of economic fragility are as important here in Nevada as in California, the Pacific Northwest and Utah,” Graham Kent, director of the Nevada Seismological Laboratory, said. “With the Seismological Society of America having their annual meeting here next week, we have a great opportunity to bring experts together with our community – those who need to put plans in place not only for disaster response but, just as importantly, a plan for quick economic recovery.”

The first of its kind in Nevada, the Earthquake Economic Resiliency Forum, organized by the Nevada Seismological Lab, is for those who hold critical positions within the local, state and federal government, small business owners, large business owners, utilities, real estate agents, news organizations, insurance agents, hospital administration, and interested citizens – anyone who will be impacted by a large earthquake event.

The aim of the meeting is to address specific solutions tailored to our communities and how we might implement them.

Managed properly, this approach can minimize the economic impact in the weeks, months and years following a large event and may be the most important aspect to a community’s long-term health.

“The latter task is no small feat given the current roadblocks that the region faces and an economy that is in an era of unprecedented growth – we must collectively plan today,” Kent said. “The first step toward economic resiliency to natural hazards is to understand all of the interrelated and potentially cascading dependencies that may occur shortly after an earthquake or major disaster.

“Let’s band together, plan together, and be prepared when the next large earthquake hits our community. Remember, on average, this border region experiences one M6 earthquake each decade, and one M7 every 30 years. Let’s take advantage of this extraordinary quiescent period in our earthquake history.”

Guest speakers will introduce an up-to-date view of earthquake hazards within the region, followed by ‘real world experience’ when it comes to building an earthquake resilient community.

Speakers include:

  • Mark Stirling, chair of Earth Sciences Department at the University of Otago, New Zealand who will present lessons learned from the destructive Canterbury Earthquake Sequence;
  • Christopher Burton of Global Earthquake Model in Pavia, Italy with his talk “Back to Normal: Earthquake Recovery Modeling Project, Napa, California;”
  • Cory Lyman, Salt Lake City Emergency Management Program director of the “Fix the Bricks” Program;
  • Dick McCarthy, executive director, California Seismic Safety Commission, in a panel discussion on “next steps;”
  • Several local experts from the Nevada Seismological Lab, the Nevada Bureau of Mines and Geology and the City of Reno.

The forum is at the Eldorado Resort Casino from 8:45 a.m. to 2:30 p.m. April 19th, 2016. The forum is free and open to the public, pre-registration is required. Please register by emailing Erik Williams at eswilliams@unr.edu.

The forum precedes the annual Seismological Society of America meeting being held in Reno, Nevada April 20-22 at the Peppermill Resort Hotel. The seismological annual meeting has attracted 800 seismologists from around the country and around the world. Inquires can be directed to Graham Kent at gkent@unr.edu.”

1915 Pleasant Valley Earthquake Centennial Field Trip— Saturday October 3—reminder!

 

1915 Pleasant Valley Field Trip – October 3, 2015

Sign up here for this field trip!

The Pleasant Valley earthquake of October 2, 1915 was the largest earthquake in Nevada’s recorded history. This earthquake ruptured the ground about 50 miles south of Winnemucca, and left a scar along the range front that was more than 35 miles long. In places, the ground surface was offset vertically by as much as 19 feet. The earthquake had a magnitude of 7.3 and was felt throughout Nevada. Damage occurred in many places, but was strongest in Pleasant Valley and in the towns of Kennedy and Winnemucca. This is the story of Nevada’s largest known earthquake and what it means to us. Continue reading.

The Nevada Bureau of Mines and Geology will lead a free, half-day field trip to Pleasant Valley and the 1915 fault rupture on Saturday October 3, 2015. The trip will consist of a short overview talk in Winnemucca about the earthquake and a car caravan excursion with two stops in the earthquake area. The excursion is a 100-mile round trip to an area where there are no services, including no cell phone services.

We ask that people car pool as much as possible and make sure any vehicle making this trip is in good condition with good tires, a spare, and a jack. Much of the trip is on gravel roads. The trip will be limited to the first 80 people who sign up, but a guidebook will be available on the 1915 earthquake centennial web page for people wanting to make the trip on their own.

All field-trip participants must fill out and sign a waiver stating that they are responsible for their own safety and for any medical expenses or damages incurred as a result of the trip. Parents must also fill out and sign a waiver for any children accompanying them on the trip. There will be a lunch stop and a short cross-country hike along the fault, so bring a lunch and some sturdy walking shoes and long pants or gators.

The trip will start with a short overview talk at the Sarah Winnemucca Conference Room in the Humboldt General Hospital, 118 E. Haskell Street, Winnemucca, Nevada at 10:00 a.m. Please park on the street or at the park, and do not park in patient parking. At 11:00 a.m. we will leave Winnemucca and travel south to Pleasant Valley. There are two stops. The first one is along the way to get an overview of the fault scarps along the range front, the geology, and the history of the area; we will enjoy lunch at this stop. The second stop is at the fault scarp where it crosses Golconda Canyon. At this stop we will talk about the earthquake, the fault scarp, shaking effects, and the history of the town of Kennedy. For those interested, we will take a short walk along the fault scarp to see the different ways it ruptured the ground and see evidence of paleoearthquakes.

1915 Pleasant Valley Earthquake Centennial Field Trip—Oct 3, 2015

1915_1_Pierce_Ranch
Photo: Rift crossing a stream at Pierce ranch, showing old and new fault scarps. The 1915 surface rupture crossed a stream here and formed a waterfall 10 feet high behind the man. The stream was flowing four times its normal flow because of some new springs that were opened up by the earthquake. (Jones, 1915, figure 12)

Sign up here for this field trip!

The Pleasant Valley earthquake of October 2, 1915 was the largest earthquake in Nevada’s recorded history. This earthquake ruptured the ground about 50 miles south of Winnemucca, and left a scar along the range front that was more than 35 miles long. In places, the ground surface was offset vertically by as much as 19 feet. The earthquake had a magnitude of 7.3 and was felt throughout Nevada. Damage occurred in many places, but was strongest in Pleasant Valley and in the towns of Kennedy and Winnemucca. This is the story of Nevada’s largest known earthquake and what it means to us. Continue reading.

The Nevada Bureau of Mines and Geology will lead a free, half-day field trip to Pleasant Valley and the 1915 fault rupture on Saturday October 3, 2015. The trip will consist of a short overview talk in Winnemucca about the earthquake and a car caravan excursion with two stops in the earthquake area. The excursion is a 100-mile round trip to an area where there are no services, including no cell phone services.

We ask that people car pool as much as possible and make sure any vehicle making this trip is in good condition with good tires, a spare, and a jack. Much of the trip is on gravel roads. The trip will be limited to the first 80 people who sign up, but a guidebook will be available on the 1915 earthquake centennial web page for people wanting to make the trip on their own.

All field-trip participants must fill out and sign a waiver stating that they are responsible for their own safety and for any medical expenses or damages incurred as a result of the trip. Parents must also fill out and sign a waiver for any children accompanying them on the trip. There will be a lunch stop and a short cross-country hike along the fault, so bring a lunch and some sturdy walking shoes and long pants or gators.

The trip will start with a short overview talk at the Sarah Winnemucca Conference Room in the Humboldt General Hospital, 118 E. Haskell Street, Winnemucca, Nevada at 10:00 a.m. Please park on the street or at the park, and do not park in patient parking. At 11:00 a.m. we will leave Winnemucca and travel south to Pleasant Valley. There are two stops. The first one is along the way to get an overview of the fault scarps along the range front, the geology, and the history of the area; we will enjoy lunch at this stop. The second stop is at the fault scarp where it crosses Golconda Canyon. At this stop we will talk about the earthquake, the fault scarp, shaking effects, and the history of the town of Kennedy. For those interested, we will take a short walk along the fault scarp to see the different ways it ruptured the ground and see evidence of paleoearthquakes.