New 2018 HAZUS Report

Updated Assessment of Risks and Vulnerability to Flood Hazards in Nevada
By Irene M. Seelye, Bunny L. Bishop, Rachel Micander, and Sydney Wilson
Year: 2018
Series: Open-File Report 2018-01
Version: supersedes Open-File Reports 2007-02, 2010-03, and 2013-03
Format: online only; 16 pages, color, 3.26 MB; contains 103 additional linked pages

This report is a summary of the HAZUS results for flood scenarios modeled along seven major rivers in Nevada. It was produced in conjunction with the updating of the State of Nevada Enhanced Hazard Mitigation Plan, 2018. This report contains 16 pages of text which include 9 full-color map figures. There are 103 links throughout the document that open related PDF files containing the detailed HAZUS-generated result reports. Those PDFs will download in a folder alongside this report. This report supersedes Open-File Reports 07-2, 10-3, and 13-3.

Radon in Nevada—the Silent Killer

“In Nevada, one in four homes tested has elevated radon concentrations.”

You can test your home or business by obtaining a radon test kit from the Nevada Radon Education Program (University of Nevada Cooperative Extension):
“Select an area on the map or click on a link below to get radon test results by zip code.”

“You can also view an interactive map of “Radon in Nevada” from Nevada Bureau of Mines and Geology’s MyHazards website. Once there, click on the “Radon” symbol and then you can view geologic units representing possible radon risk combined with radon potential and average maps for Nevada.”

January and February are Radon Awareness Months


Radon Awareness MonthsJan and Feb 2018Free Radon Test Kits!
Learn about radon hazards and how you can test your home or business for free:

“According to EPA estimates, exposure to radon is the leading cause of lung cancer among nonsmokers and is responsible for about 21,000 lung cancer deaths every year, more than drunk driving, household falls, drowning, or home fires.”

Can radon problems be fixed or prevented? Director of the University of Nevada Cooperative Extension’s Radon Education Program Susan Howe breaks down radon health risks, remediation and prevention.

From Nevada Today, 1/11/2018, by Susan Howe
Read article here:

EPA National Radon Action Month Information

Carson Valley Earthquake Anniversary—June 3, 1887

Tomorrow is the anniversary of the 1887, June 3 Carson Valley earthquake.

1887, June 3 Carson Valley Earthquake

“This was a violent earthquake in western Nevada’s history, with damaging effects spanning from Carson City to Genoa. Several buildings were likely torn down or parts rebuilt because of earthquake damage.

The earthquake began at about 2:40 to 2:47 A.M. on Friday, June 3, 1887 (PST). It was reported to have lasted from 3 to 10 seconds (in one account 30 seconds) and was preceded by a heavy rumbling sound (which is described as resembling a dead-axe freight wagon driven rapidly over frozen ground, CDI 6/7/87). There are no foreshocks reported, and only three slight shocks were reported immediately following at about 3 A.M. (Table _ lists 12 reported aftershocks from 20 days following the event). Miners coming off work from Gold Hill could plainly see the buildings of Virginia City vibrating and felt the earth moving under their feet (VEC 6/3/87). Some that were outside looked at the moon and noted that the vibration was as plainly visible to the organ of sight as it was to the sense of feeling (VEC 6/7/87). James Raycraft was rushing for a doctor in Carson City when the shock threw him face forward to the ground (MA 6/3/87). Other people on the streets of Carson City were also thrown to the ground (TE 6/4/87). There was general hysteria in Carson City, Genoa, and Virginia City, and most people vacated their premises wearing only the garments they were sleeping in. “The inhabitants of every house in town were roused from their slumbers, and few sought their beds until morning sun gave evidence that another day was granted” (TNT 6/3/87). The streets were filled with people, some badly frightened, some considerably amused, and all chattering volubly over the occurrence, with each person relating their own personal experience (MA 6/3/87). In Genoa, every man, woman, and child apparently joined together in prayers on Main Street.

The 1887 earthquake caused damage to buildings in Carson City, Genoa, Carson Valley, and to a minor extent in Virginia City. Nonstructural damage extended westward into Lake Tahoe, and into the central Sierra Nevada.”

 The excerpt shown above is from page 94 of this publication:
Reevaluation of pre-1900 earthquakes in western Nevada
By Craig M. dePolo, Alan R. Ramelli, Ron H. Hess, and John G. Anderson


Current Nevada Earthquake Activity
Nevada Seismological Laboratory

Historical Nevada Earthquake Activity
MyHazards Nevada
See Nevada Bureau of Mines and Geology ArcGIS Web Application: MyHazards Nevada.
Turn on the earthquake layer (expand with the arrow to turn on the lower magnitudes).
Click on an earthquake epicenter to get the date.

Read More Here  (road log covers Genoa fault)  (road log covers faults in the Truckee Meadows)

1997 New Year’s Floods—20th Anniversary


The start of the new year marked the 20th anniversary of the devastating 1997 New Year’s floods of western Nevada, which caused over 450 million dollars in damage and closed downtown businesses in Reno for weeks. This event was caused by a phenomena known as the “Pineapple Express” (more generally known as an “atmospheric river”) in which several warm storms tapped into moisture plumes sourced near the Hawaiian Islands. These storms produced heavy rainfall in the Sierra Nevada Mountains, saturating the soil and melting existing snow pack resulting in flows around 18,000 cfs in the Truckee River. Footage from that event is shared below from the KTVN Channel 2 News Facebook page:

You can also see the 1997 flood extents for the Carson River, Reno area, and Walker River in NBMG’s MyHazards-Nevada interactive web map:

Click the “Floods and Drought” group (wave icon) then checkmark on the “Historical Floods – NBMG” layer to turn on the 1997 flood layers. Several sublayers available for each flood area, which can be viewed by clicking the gray triangle next to the layer names to expand the layers.

Given that western Nevada has a flood watch in effect for this weekend, it’s worth noting that there are other useful layers available in MyHazards-Nevada, such as live feeds for weather watches and advisories, radar, and current flooding, in addition to layers for other geologic hazards including a live feed for recent earthquakes.

For those interested in learning more about the 1997 New Year’s floods, NBMG Special Publication 23 is a detailed report on that event:
Links to other flood- and weather-related publications are available on this landing page.

Server Upgrade for NBMG Web Applications

With the help of the University IT staff, we recently completed a major server upgrade for most of our web applications and GIS services that are available from the Maps & Data page of our website. As a result of this server upgrade, most of our applications are now supported on desktop and mobile devices, cross platform (Apple, Windows, and Android), and with increased performance and stability.

Please note that some applications/web maps now also have new, simplified URLs. These include:

Application Name New URL
Mining Districts
43-101 Reports
MyPlan (requires login for authorized users only)
Quaternary Faults
Topographic Maps Https://
1:500K Geologic Map of NV
Oil & Gas
Reno Minerals
Minerals and Energy
Renewable Energy

Please be sure to update any bookmarks you may have to point to these new URLs.

Thank you for your patience as we worked through this upgrade. If you experience any trouble with our web applications, please contact or 775-784-6691.

AEG Meeting—Earthquake Hazards in Carson City—by Craig dePolo




Thursday, January 21, 2016
SPEAKER: Dr. Craig dePolo, Nevada Bureau of Mines and Geology

“The Capital of Earthquake Country: Earthquake Hazards in Carson City”




@ 775¬221¬1369 or

Cost: Members: $25.00; non¬members: $29.00

The first 4 students that RSVP and check in at the registration table will be sponsored this month compliments of Wood Rodgers.

Carson City has the highest earthquake hazard in Nevada and, perhaps, in the entire Basin and Range Province. Several historical earthquakes have shaken the city, including one of the most damaging earthquakes in Nevada, the 1887 Carson City earthquake. Background earthquakes, magnitude 3 and smaller, are frequent. Areas of persistent background seismicity include the northern part of Carson City, south of Prison Hill, and the northern Pine Nut Mountains. Several young earthquake faults exist in and around Carson City. Larger faults bound the mountains and smaller faults are within the mountains and/or basins. There is evidence in the geologic record of local paleoearthquakes with magnitudes in the upper 6 to 7 range, some of which were ~200 years apart along a single fault. Probability calculations indicate it is likely (78–79%) Carson City will experience Modified Mercalli Intensity (MMI) VI shaking levels over a 50-year time period. The probability of damaging MMI VII shaking over a 50-year time period the probability is 55–57%. Carson City also faces potential surface ruptures, earthquake-induced liquefaction, and earthquake-induced landslides and rock falls.

Ph.D. Geology, University of Nevada, Reno, 1998
M.S. Geology, University of Nevada, Reno, 1989
B.S. Geology, California State University, Sacramento, 1982

Dr. dePolo is a Research Geologist for the Nevada Bureau of Mines and Geology at the University of Nevada, Reno, Mackay School of Earth Sciences and Engineering. His areas of expertise include paleoseismology, earthquake hazard characterization, neotectonics, and Quaternary geology. He has professional experience as an assistant technician in the Nevada Seismological Laboratory at the University of Nevada, Reno, as a consulting geologist for D.B. Slemmons, and as a teaching assistant in the Department of Geological Sciences and Engineering at the University of Nevada, Reno.