Hydroacoustic Signals from Presumed CHASE Explosions off Vancouver Island in 1969-1970: A Modern Perspective

Talandier, Jacques; Okal, Emile A.

doi:10.1785/gssrl.75.2.188

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Other examples of in-water explosions for which seismic magnitudes exist are also included in the graph and the values of their estimated yield and magnitude are listed in Table 3. The source for the CHASE explosions, shown in yellow on the graph, is from Talandier and Okal (2004), the source for the 2016 explosions offshore Florida, shown in purple on the graph, is Heyburn et al (2018), the source for the 1999 Dead Sea explosions, shown in orange on the graph, is Gitterman and Shapira (2001), and the 2021 offshore Florida explosions use the IDC estimates for the magnitudes. The values for the events studied in this paper are shown in red on the graph and identified through a label.…”

Section: Relating Charge Size To Seismic Magnitude For In-water Explo...mentioning

confidence: 99%

International Data Centre Bulletin Events Triggered by Controlled Underwater Explosions of World War 2 Ordnances

Bittner¹,

Bras²,

Mialle³

et al. 2022

Pure Appl. Geophys.

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This paper focuses on events linked to controlled underwater explosions of World War 2 (WW2) ordnances which were included in the Reviewed Event Bulletin (REB). Data used for the study were provided by seismic stations of the International Monitoring System (IMS) in 2020. Examined events were triggered by devices of different charge size and took place in several locations in Europe. There were also other, previously detected WW2 ordnance underwater explosions which could be compared to events in 2020. It is shown that these relatively small underwater explosions listed in the REB, with good coupling to the ground, are located by the IMS network within 20 km from the ground truth. Charge size of explosive material was related to event magnitude. Results were compared to magnitudes published for underwater explosions of larger sizes. The conclusion is that an in-water explosion will result in seismic waves with amplitudes equivalent to the amplitudes of seismic waves from an in-ground explosion with 17.2 times the yield in kT.

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Section: Relating Charge Size To Seismic Magnitude For In-water Explo...mentioning

confidence: 99%

International Data Centre Bulletin Events Triggered by Controlled Underwater Explosions of World War 2 Ordnances

Bittner¹,

Bras²,

Mialle³

et al. 2022

Pure Appl. Geophys.

View full text Add to dashboard Cite

show abstract

“…Finally, a number of media including French "reference" newspapers (e.g., Le Figaro 2007;Le Monde 2007) reported speculation that the Mostaganem waves had been generated by the testing of weaponry as part of a secret foreign mission in Algerian waters, even suggesting the implosion of a submarine. Such a scenario remains highly improbable, since a gross order-of-magnitude estimate of the yield necessary to generate a metric tsunami at distances on the order of at least 10 km would approach 1 kt (Mirchina and Pelinovsky 1988); even much smaller explosions are known to give rise to spectacular basin-wide T waves (Reymond et al 2003;Talandier and Okal 2004). In addition, a large implosive source would also have generated strong acoustic waves detectable around the Mediterranean Basin, as evidenced by the case of the ARA San Juan (Dall'Osto 2019), and/or classic seismic signals as in the case of the Kursk (Koper et al 2001;Sèbe et al 2005).…”

Section: Event E --13 Apr 2018mentioning

confidence: 99%

On the possibility of seismic recording of meteotsunamis

Okal

2020

Nat Hazards

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We use the horizontal components of land-based seismometers in the vicinity of shorelines to apply to meteotsunamis the deconvolution algorithm introduced by Okal (Pure Appl Geophys 164: 2007) in order to recover time series of tsunami amplitudes from seismic recordings. For a selected set of seven such events recorded at 16 seismic stations, we obtain equivalent wave amplitudes and horizontal polarizations, the latter expressing the directions of particle motions at the surface of the sea. Our amplitudes are generally on the same order of magnitude as available regional records or reports, and the direction of tsunami currents is found mostly parallel to the relevant shorelines. In particular, seismic records available at three Spanish stations suggest that the unexplained waves which killed twelve people in Mostaganem, Algeria in 2007, had a meteorological origin. Our results, of an exploratory nature, suggest that seismic records could play an important role in the further understanding of the structure of meteotsunamis.

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The generation of T waves by earthquakes

Okal

2008

Advances in Geophysics Volume 49

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Hydroacoustic Signals from Presumed CHASE Explosions off Vancouver Island in 1969-1970: A Modern Perspective

Cited by 4 publications

References 22 publications

International Data Centre Bulletin Events Triggered by Controlled Underwater Explosions of World War 2 Ordnances

International Data Centre Bulletin Events Triggered by Controlled Underwater Explosions of World War 2 Ordnances

On the possibility of seismic recording of meteotsunamis

The generation of T waves by earthquakes

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