Exploring the Effects of Emplacement Conditions on Explosion P/S Ratios across Local to Regional Distances

High-frequency (∼> 2 Hz) seismic P/S amplitude ratios are well-established as a discriminant to distinguish between natural earthquakes and underground explosions at regional distances (∼200–1500 km). As research shifts toward identifying lower-yield events, work has begun to investigate the potential of this discriminant for use at local distances (<200 km), in which initial results raise questions about its effectiveness. Here, we utilize data from several chemical explosion experiment series at the Nevada National Security Site in southern Nevada in the United States to study explosion Pg/Lg ratios across the range of local to regional distances. The experiments are conducted over differing emplacement conditions, with contrasting geologies and a variety of yields and depths of burial, including surface explosions. We first establish the similarities of Pg/Lg ratios from chemical explosions to those from historic nuclear tests and conclude that, as previous data have suggested, chemical explosion ratios are good proxies for nuclear tests. We then examine Pg/Lg ratios from the new experiment series as functions of distance, yield, depth of burial, and scaled depth of burial (SDOB). At far-local and regional distances, we observe consistently higher ratios from hard-rock explosions compared to ones in a weaker dry alluvium medium, consistent with prior regional distance results. No other trends with yield, depth of burial, or SDOB are strongly evident. Scatter in the observed ratios is very high, particularly at the shortest event-to-station distances, suggesting that small-scale path effects play a significant role. On average, the local distance explosion Pg/Lg ratios show remarkable consistency across all the variations in emplacement. Explosion source models will need to reproduce these results.

Third State Intervention before the International Court of Justice in International Environmental Law Cases

<p>Third state intervention before international institutions originated in international arbitration around 1875 and has been included in the statute of the International Court since the foundation of the Permanent Court of International Justice (PCIJ) and is therefore no new phenomenon. Today, most systems of international dispute settlement provide for the possibility of third state intervention. Nevertheless intervention before the International Court of Justice (ICJ) has been used by states sparsely and seems underdeveloped. The statute of the ICJ provides for two ways of intervention in its arts 62 and 63. There have been few applications under these provisions. Looking at the court’s orders in these few cases, the court seems to have adopted a restrictive approach towards allowing applications to intervene. This paper looks at the institution of intervention in the area of international environmental law disputes. There have been two relevant disputes of this kind before the ICJ: the Nuclear Tests litigation and the recent litigation of Whaling in the Antarctic. Both of these cases dealt with the question of state obligations towards the protection of the environment. The applications to intervene in Nuclear Tests failed for reasons that will be explained in more detail below. New Zealand’s application to intervene in Whaling in the Antarctic was authorized by the ICJ on the 6 February 2013 under art 63 of the Statute of the ICJ. The case is exceptional in that it is only the second time the ICJ allowed intervention under art 63. Both cases demonstrate that there are environmental issues that concern more than only the nations that are parties to the dispute. They indicate that intervention plays a particularly strong role in environmental issues because these issues by their nature often affect more than just two states. This paper analyses how the shared environmental concern of the international community might lead to an extension of intervention before the ICJ. It further more looks at the issues that arose before the court in connection with the intervention in Whaling in the Antarctic and how these issues were dealt with.</p>

Third State Intervention before the International Court of Justice in International Environmental Law Cases

<p>Third state intervention before international institutions originated in international arbitration around 1875 and has been included in the statute of the International Court since the foundation of the Permanent Court of International Justice (PCIJ) and is therefore no new phenomenon. Today, most systems of international dispute settlement provide for the possibility of third state intervention. Nevertheless intervention before the International Court of Justice (ICJ) has been used by states sparsely and seems underdeveloped. The statute of the ICJ provides for two ways of intervention in its arts 62 and 63. There have been few applications under these provisions. Looking at the court’s orders in these few cases, the court seems to have adopted a restrictive approach towards allowing applications to intervene. This paper looks at the institution of intervention in the area of international environmental law disputes. There have been two relevant disputes of this kind before the ICJ: the Nuclear Tests litigation and the recent litigation of Whaling in the Antarctic. Both of these cases dealt with the question of state obligations towards the protection of the environment. The applications to intervene in Nuclear Tests failed for reasons that will be explained in more detail below. New Zealand’s application to intervene in Whaling in the Antarctic was authorized by the ICJ on the 6 February 2013 under art 63 of the Statute of the ICJ. The case is exceptional in that it is only the second time the ICJ allowed intervention under art 63. Both cases demonstrate that there are environmental issues that concern more than only the nations that are parties to the dispute. They indicate that intervention plays a particularly strong role in environmental issues because these issues by their nature often affect more than just two states. This paper analyses how the shared environmental concern of the international community might lead to an extension of intervention before the ICJ. It further more looks at the issues that arose before the court in connection with the intervention in Whaling in the Antarctic and how these issues were dealt with.</p>

Godzilla (1998) as camp de-extinction narrative

Godzilla is one of the most famous de-extinct monsters in global popular cinema. Fan loyalty to the original Toho Studios conception of the creature as a super-powered, dinosaur-like creature helps explain the negative response to Roland Emmerich’s 1998 Hollywood version, which re-imagines Godzilla as a giant, irradiated twentieth-century iguana. Emmerich’s film is plotted around the monster’s attempt to use subterranean New York City as a spawning ground. The creature lays eggs that later hatch into baby Godzillas that look suspiciously like Jurassic Park-style velociraptors. Indeed, the movie plays like an expanded version of the last twenty minutes of The Lost World: Jurassic Park (1997): a dinosaur-like creature runs amok in a major American city and is eventually defeated by a plan involving its offspring. Emmerich’s Godzilla is famous for being ‘Godzilla in name only’, yet its extensive intertextuality with The Lost World foregrounds de-extinction themes and imagery. Furthermore, Godzilla (1998) emphasises human action - in this case, 1950s French nuclear tests in French Polynesia - as the cause of the mutant creature’s emergence. Humans causing de-extinction is a key feature of the entire Godzilla franchise and of similar creature features from the 1950s to the present. Akin to its 1950s predecessors, Godzilla’s light, intentionally (and sometimes unintentionally) comedic tone open it to camp readings of the kind analysed by Bridgitte Barclay, who writes that the narrative and aesthetic shortcomings of schlocky sf B movies ‘disengage the audience from the filmic world and expose the mechanics of storytelling, making the master narrative a story and thereby resisting it by showing it as such’. Godzilla does just that, deflating its own anthropocentrism and rampant pro-militarism via its blatantly derivative story, shoddy digital effects and ham-handed dialogue.

Bolide Energetics and Infrasound Propagation: Exploring the 18 December 2018 Bering Sea Event to Identify Limitations of Empirical and Numerical Models

Infrasound observations are an important tool in assessing the energetics of bolides and can help quantify the flux of meteoroids through Earth’s atmosphere. Bolides are also important atmospheric sources for assessing long-range infrasound propagation models and can be used as benchmark events for validating the International Monitoring System (IMS) infrasound network, which is designed to detect nuclear tests in the atmosphere. This article exploits unique infrasound observations from a large bolide recorded on IMS infrasound arrays and high-density infrasound deployments in the United States to assess limitations in infrasound source scaling relationships. The observations provide an unprecedented sampling of infrasound propagation along a transect at an azimuth of 60° from the source to a distance of ∼8000 km. Widely used empirical laws for assessing bolide energetics and state-of-the-art numerical models for simulating infrasound propagation are assessed to quantify important discrepancies with the observations. In particular, empirical laws for equivalent yield, which are based on signal period and are assumed to be relatively unaffected by propagation effects, can be heavily contaminated by site noise. In addition, by modeling infrasound propagation over a range of ∼8000 km, we show that state-of-the-art models do not reproduce the observed amplitude decay over this long range (which decays by a rate of at least 2 higher than can be modeled).

REVIEW: Moruroa Files: The files, the book and the lies

Toxique: Enquête sur les essais nucléaires français en Polynésie, by Sébastien Philippe and Tomas Statius, and the Moruroa Files microsite. Paris: PUF/Disclose, 2021. 192 pages. ISBN 9782130814849https://moruroa-files.org/ THE COMBINATION of nuclear expertise (Sebastien Philippe), inquisitive journalism (Tomas Statius) and the investigative approach by Interprt (a collective of architects specialising in the forensic analysis of environmental crimes) of around 2000 declassified French government documents in 2013 called the Moruroa Files, resulted in the explosive book Toxic about what was already known to the Ma’ohi Nui (French Polynesia) people. That since 1966 (55 years ago), the French government has consistently lied about and concealed the deadly consequences of their nuclear tests, which they now seem to acknowledge (French admit nuclear test fall out, 2006), to the health of the populations and their environment.

Applying Waveform Correlation to Reduce Seismic Analyst Workload Due to Repeating Mining Blasts

ABSTRACT Agencies that monitor for underground nuclear tests are interested in techniques that automatically characterize mining blasts to reduce the human analyst effort required to produce high-quality event bulletins. Waveform correlation is effective in finding similar waveforms from repeating seismic events, including mining blasts. We report the results of an experiment to detect and identify mining blasts for two regions, Wyoming (U.S.A.) and Scandinavia, using waveform templates recorded by multiple International Monitoring System stations of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO PrepCom) for up to 10 yr prior to the time of interest. We discuss approaches for template selection, threshold setting, and event detection that are specialized for characterizing mining blasts using a sparse, global network. We apply the approaches to one week of data for each of the two regions to evaluate the potential for establishing a set of standards for waveform correlation processing of mining blasts that can be generally applied to operational monitoring systems with a sparse network. We compare candidate events detected with our processing methods to the Reviewed Event Bulletin of the International Data Centre to assess potential reduction in analyst workload.

Full Moment Tensor Solutions of U.S. Underground Nuclear Tests for Event Screening and Yield Estimation

ABSTRACT Moment tensor (MT) solutions are proving increasingly valuable in explosion monitoring, especially now that they are more routinely calculated for the unconstrained, full (six component) MT. In this study, we have calculated MTs for U.S. underground 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 additional chemical explosions at the test site. The result is an extensive database of MTs that can be used to assess the performance of important monitoring tasks such as event identification and yield determination. We test the explosion event screening on the fundamental lune of the MT eigensphere and find MT screening to be a robust discriminant between earthquakes and explosions. We then explore the estimation of moment-derived yield, in which we find that material properties are the largest contributor to differences in the estimated moment-to-yield ratio. Further research conducted on this dataset can be used to develop, test, and improve various explosion monitoring methodologies.

Evaluation of the Detection Ability of New Infrasound Networks Installed by Korea Meteorological Administration

The Korea Meteorological Administration (KMA) installed infrasound networks in Cheorwon and Yanggu. These networks have been operated for detecting infrasound generated from artificial explosions, such as those due to North Korea's nuclear tests, and from natural phenomena such as the volcanic eruption of Mt. Baekdu. Currently, the KMA is simultaneously performing infrasound analysis and seismic wave analysis to discriminate between natural and artificial earthquakes. To efficiently perform the discrimination and analysis of artificial earthquakes, three infrasound networks were expanded in the West Sea and northern Gyeonggi-do Gyodong-do, Paju, and Yeoncheon. In this study, 22 cases of artificial earthquake events that occurred in North Korea in January 2020 were analyzed to test the analysis capabilities of the three newly installed infrasound networks. The results of the analysis confirmed that the newly installed infrasound networks exhibited a higher infrasound detection rate than the existing Cheorwon and Yanggu infrasound networks. The Cheorwon and Yanggu observation networks are being planned for relocation and installation due to aging and poor site conditions. The use of the new infrasound network is expected to improve the detection rate and analysis accuracy with respect to artificial earthquakes. Furthermore, it is expected to enhance the detection capability of infrasound generated from various physical phenomena such as nuclear tests performed by North Korea and volcanic eruption of Mt. Baekdu.