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Nevada National Security Site

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Journal Article
Published: 02 June 2023
Bulletin of the Seismological Society of America (2023) 113 (4): 1493–1512.
... ), and the recordings consist of three unique sensor deployments across three distinct lithologies. These deployments were a result of the Source Physics Experiment (SPE), a set of underground chemical explosions conducted at the Nevada National Security Site (NNSS), executed with the goal of analyzing acoustic...
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Journal Article
Published: 27 October 2020
Bulletin of the Seismological Society of America (2021) 111 (1): 571–589.
..., partially collapsed chimneys can have remnant subsurface cavities left in place above collapsed rubble. The 1964 nuclear test HADDOCK, conducted at the Nevada test site (now the Nevada National Security Site), formed a partially collapsed chimney with no surface crater. Understanding the subsurface...
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Journal Article
Published: 19 November 2019
Bulletin of the Seismological Society of America (2020) 110 (1): 110–126.
...Leiph Preston; Christian Poppeliers; David J. Schodt ABSTRACT As a part of the series of Source Physics Experiments (SPE) conducted on the Nevada National Security Site in southern Nevada, we have developed a local‐to‐regional scale seismic velocity model of the site and surrounding area. Accurate...
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Relief map of Nevada National Security Site (NNSS) showing the locations of Physics Experiment One (PE1)‐A (orange star) and nearby stations (green triangles) used or discussed in the analysis. Insets show larger region and details close to the explosion.
Published: 26 June 2025
Figure 1. Relief map of Nevada National Security Site (NNSS) showing the locations of Physics Experiment One (PE1)‐A (orange star) and nearby stations (green triangles) used or discussed in the analysis. Insets show larger region and details close to the explosion.
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Topographic map of the Nevada National Security Site (NNSS) region, with NNSS outlined in solid white and notable features labeled: FF, Frenchman flat; JF, Jackass flat; LSM, Little Skull Mountain; RM, Red Mountain; RV, Rock Valley (approximate area outlined in dashed white lines), SM, Skull Mountain; SR, Specter range; YF, Yucca flat; and YM, Yucca Mountain. The seismic velocity imaging area and map area of Figure 2 are outlined in blue. Topographic data are from JPL and NASA (2013).
Published: 27 December 2023
Figure 1. Topographic map of the Nevada National Security Site (NNSS) region, with NNSS outlined in solid white and notable features labeled: FF, Frenchman flat; JF, Jackass flat; LSM, Little Skull Mountain; RM, Red Mountain; RV, Rock Valley (approximate area outlined in dashed white lines), SM
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(a,b) Location of Climax Stock at the Nevada National Security Site and the Source Physics Experiment (SPE) seismic array design. The map in panel (a) shows the shot location (star) and the sensor locations (blue diamonds) relative to the surface geology and mapped surface fault traces. (c) The experimental design of the six SPE shots is labeled with their name, yield, and source depth. The color version of this figure is available only in the electronic edition.
Published: 27 September 2023
Figure 2. (a,b) Location of Climax Stock at the Nevada National Security Site and the Source Physics Experiment (SPE) seismic array design. The map in panel (a) shows the shot location (star) and the sensor locations (blue diamonds) relative to the surface geology and mapped surface fault traces
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Maximum aftershock analysis for 134 Nevada National Security Site (NNSS) explosions with at least one aftershock (many events overlay one another). (a) Explosion magnitude (mmain) versus the largest magnitude aftershock (mmax). The dashed lines between 1≤(mmain−mmax)≤4 cover about 97% of the events. DAUPHIN and LEYDEN are near the one‐to‐one line (solid line), in which mmain=mmax. In both the cases the maximum magnitude event is a collapse (filled circles). (b) Histogram of magnitude difference between explosion and the largest aftershock. The mean is 2.54; and, therefore, for the NNSS, Båth’s law for explosions is about 2.5 (ΔmNTS‾=2.54).
Published: 22 August 2023
Figure 1. Maximum aftershock analysis for 134 Nevada National Security Site (NNSS) explosions with at least one aftershock (many events overlay one another). (a) Explosion magnitude ( m main ) versus the largest magnitude aftershock ( m max ). The dashed lines between 1 ≤ ( m
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(a) Topography of the Nevada National Security Site (NNSS) and (b) the topography of the location of a 3.6 magnitude earthquake in Idaho in a region that was equipped with infrasound sensors (Johnson et al., 2020). The approximate location of sensors is denoted by a blue dot, earthquakes of interest are denoted by red dots (sized by magnitude), and the red circle indicates a radius of 50 km.
Published: 02 June 2023
Figure 11. (a) Topography of the Nevada National Security Site (NNSS) and (b) the topography of the location of a 3.6 magnitude earthquake in Idaho in a region that was equipped with infrasound sensors ( Johnson et al. , 2020 ). The approximate location of sensors is denoted by a blue dot
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The Yucca Flat region of the Nevada National Security Site (NNSS). Purple and green stars mark locations of Source Physics Experiments phase I and phase II, respectively. THOR 1 and THOR 2 shot points are shown as red and blue crosses, respectively (black marker on THOR 1 line indicates shot point used in Fig. 3). Round craters formed as a result of legacy nuclear testing occur along both transects. Orange rectangle in inset delineates Yucca Flat map extent.
Published: 13 August 2019
Figure 1. The Yucca Flat region of the Nevada National Security Site (NNSS). Purple and green stars mark locations of Source Physics Experiments phase I and phase II, respectively. THOR 1 and THOR 2 shot points are shown as red and blue crosses, respectively (black marker on THOR 1 line indicates
Journal Article
Journal: Geosphere
Published: 15 January 2025
Geosphere (2025) 21 (2): 130–147.
... to measure the surface topographic change resulting from two underground explosions at the Dry Alluvium Geology site in Yucca Flat, Nevada National Security Site, southern Nevada, United States. We find areas of 5–7 cm of subsidence that are not directly above the explosion source but rather 200–300 m away...
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Journal Article
Published: 12 March 2025
Seismological Research Letters (2025) 96 (4): 2418–2430.
... complexities illuminated by individual earthquake sequences. These findings demonstrate how detailed analyses of small earthquakes can provide fundamental information for understanding earthquake processes in the region and inform future experiments at the Nevada National Security Site. * Corresponding...
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Journal Article
Published: 19 March 2019
Bulletin of the Seismological Society of America (2019) 109 (3): 1071–1081.
... characterizations. To further investigate local P / S ratios, we utilize data from the Source Physics Experiment (SPE) and the surrounding seismicity in southern Nevada. The SPE is composed of a series of chemical explosions located at the Nevada National Security Site (NNSS; Fig.  1 ) and is designed...
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Journal Article
Published: 08 April 2020
Seismological Research Letters (2020) 91 (3): 1488–1499.
...Brian A. Young; Robert E. Abbott Abstract The Leo Brady Seismic Network (LBSN, originally the Sandia Seismic Network) was established in 1960 by Sandia National Laboratories to monitor underground nuclear tests (UGTs) at the Nevada National Security Site (NNSS, formerly named the Nevada Test Site...
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Journal Article
Published: 04 October 2023
The Seismic Record (2023) 3 (4): 259–268.
... was designed to improve our physics‐based understanding of explosion sources for the purposes of nuclear test monitoring ( Snelson et al. , 2013 ). Phase I consisted of six chemical explosions in a granite geology on the Nevada National Security Site (NNSS), whereas phase II consisted of four chemical...
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Journal Article
Published: 16 January 2025
Bulletin of the Seismological Society of America (2025) 115 (3): 1308–1317.
...‐based moment magnitude estimates of small earthquakes ( M L 0–3) in the Rock Valley, Nevada, region within the Nevada National Security Site. The Rock Valley data set is of particular interest because it allows us to explore the changes in uncertainties of the coda calibration method with earthquake...
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Series: Special Publication
Published: 01 August 2022
DOI: 10.2110/sepmsp.113.05
EISBN: 9781565763678
... that a belt of Permian deformation extends from southeast (SE) California northward at least to the Timpahute Range. The Tempiute Ridge folds and SPFZ have the same distinctive geometries, styles, and kinematics as structures in the Nevada National Security Site. The mountain-size, E-vergent Tempiute Ridge...
Journal Article
Published: 28 April 2021
Seismological Research Letters (2021) 92 (5): 2952–2960.
...Richard Alfaro‐Diaz; Ting Chen Abstract The Source Physics Experiment (SPE) is a series of chemical explosions at the Nevada National Security Site (NNSS) with the goal of understanding seismic‐wave generation and propagation of underground explosions. To understand explosion source physics...
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Journal Article
Published: 26 June 2025
Bulletin of the Seismological Society of America (2025)
...Figure 1. Relief map of Nevada National Security Site (NNSS) showing the locations of Physics Experiment One (PE1)‐A (orange star) and nearby stations (green triangles) used or discussed in the analysis. Insets show larger region and details close to the explosion. ...
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Journal Article
Published: 01 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2A): 706–718.
...Moira L. Pyle; Stephen C. Myers; William R. Walter; Kenneth D. Smith Abstract The Source Physics Experiment ( SPE ) is a series of chemical explosions at the Nevada National Security Site (NNSS, formerly the Nevada Test Site) designed to improve our understanding of explosion physics. A future SPE...
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Journal Article
Published: 21 September 2021
Bulletin of the Seismological Society of America (2022) 112 (1): 538–552.
... nuclear tests conducted at the Nevada National Security Site using seismic recordings primarily from the Livermore Nevada Network. We are able to determine them for 130 nuclear explosions from 1970 to 1996 for a range of yields and under a variety of material conditions, which we have supplemented with 10...
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