gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-4-0838ZSEVLXgtcrust-2075Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSВОССТАНОВЛЕНИЕ ПОСЛЕДОВАТЕЛЬНОСТИ АФТЕРШОКОВ ЗЕМЛЕТРЯСЕНИЯ В СЕВЕРНОЙ АТЛАНТИКЕ С ПОМОЩЬЮ КРОСС-КОРРЕЛЯЦИИ ВОЛНОВЫХ ФОРМRECOVERY OF THE AFTERSHOCK SEQUENCE OF THE NORTH ATLANTIC EARTHQUAKE USING WAVEFORM CROSS-CORRELATIONhttps://orcid.org/0000-0002-6993-6961КитовИ. О.KitovI. O.

119334, Москва, Ленинский пр-т, 38/1

38-1 Leninsky Ave, Moscow 119334 

ikitov@mail.ruhttps://orcid.org/0000-0002-0031-4654СанинаИ. А.SaninaI. A.

119334, Москва, Ленинский пр-т, 38/1

38-1 Leninsky Ave, Moscow 119334 

Институт динамики геосфер РАНРоссияInstitute of Geospheres Dynamics of Russian Academy of SciencesRussian Federation202516082025164838838Copyright © Китов И.О., Санина И.А., 20252025Китов И.О., Санина И.А.Kitov I.O., Sanina I.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/2075

Небольшая последовательность афтершоков землетрясения с магнитудой mb=4.2, связанного с вулканическими и тектоническими процессами в Северной Атлантике, была использована для оценки эффективности метода кросс-корреляции волновых форм (ККВФ) при обнаружении слабых сигналов и событий на телесейсмических расстояниях. Результаты применения ККВФ сравниваются с результатами, полученными в Международном центре данных (МЦД) и представленными в стандартном бюллетене явлений (СБЯ). Метод ККВФ позволяет понизить порог обнаружения повторяющихся сигналов от близких в пространстве источников в несколько раз по сравнению с энергетическими детекторами. Он уже применялся в МЦД к афтершоковым последовательностям большого и среднего по магнитуде землетрясения с относительно высокими отношениями сигнал/шум для ассоциированных с событиями сигналов. Было найдено от 50 до 70 % истинных по определению МЦД событий дополнительно к СБЯ. Для рассматриваемого землетрясения все автоматически созданные с помощью ККВФ гипотезы обрабатывались опытным аналитиком МЦД, что давало возможность формирования событий по строгим критериям МЦД. В СБЯ было 38 сейсмических событий, а метод ККВФ добавил 26 афтершоков, причем была применена итеративная процедура поиска всех возможных источников с использованием вновь найденных афтершоков для повторного применения ККВФ. Высокая эффективность обнаружения событий с низкой магнитудой в Северной Атлантике на телесейсмических расстояниях от регистрирующих станций также распространяется на исследования сейсмичности в других регионах, в том числе приарктических и арктических.

A short sequence of aftershocks of the mb=4.2 earthquake associated with volcanic and tectonic processes in the North Atlantic was used to evaluate the efficiency of the waveform cross-correlation method (WCC) in detecting weak signals and events at teleseismic distances. The results of the WCC application are compared with those obtained at the International Data Center (IDC) and presented in the Standard Event Bulletin (SEB). The WCC method allows spatially close repeating-signal detection threshold to be several times lower when compared to energy detectors. It has already been applied at the IDC to aftershock sequences of large and moderate earthquakes with relatively high signal-to-noise ratios for event-associated signals. 50 to 70 percent of events, defined as true by the IDC, were found in addition to those listed in the SEB. All hypotheses, automatically generated for the earthquake under consideration by the WCC, were processed by an experienced IDC analyst, which made it possible to generate events according to strict IDC quality criteria. 38 seismic events listed in the SEB were supplemented with 26 aftershocks trough the WCC method, with an iterative procedure applied to search for all possible sources using the newly found aftershocks for the repeated application of the WCC. High efficiency in detection of low-magnitude events in the North Atlantic at teleseismic distances from the recording stations applies also to seismicity studies in other regions, including subarctic and arctic.

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The authors declare that there are no conflicts of interest present.