Full paper version is available on arxiv.org - [2603.00094] An example of regional seismicity recovery on June 22, 2020, using waveform cross-correlation
Research Square
Abstract
June 22nd, 2020 was an
important day for nuclear test monitoring. The US undersecretary, Thomas
DiNanno, made an official claim that a secret nuclear test was conducted at the
Lop Nor testing site on that day. However, the Provisional Technical
Secretariat (PTS) of the Comprehensive Nuclear-Test-Ban Treaty Organization
(CTBTO) reported that there were no seismic events consistent with a nuclear
explosion on that date. This means that the event was either hidden under the
threshold of the international monitoring system (IMS), or it was missed by the
international data center (IDC). Alternatively, no event occurred. All
scenarios are of interest to the scientific community. The routine processing
of seismic data by the IDC is well documented in open sources. The threshold
for detection is not uniform across the globe, especially in continental areas.
Additionally, it is not low enough to detect weapon-sized explosions using the
cavity decoupling method. There are methods to lower this threshold using
waveform cross-correlation (WCC) techniques. On June 22th, 2020, the IDC ran a
preliminary pipeline for processing seismic data from the IMS. This was done in
a testing mode. Since 2020, the development of WCC methods has allowed for
revisiting cases and obtaining high-quality reports on events that were not
reported five years ago.
Key words: CTBTO, IMS, IDC, waveform cross correlation, cavity
decoupling
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