The 11 October 2010 Novaya Zemlya Earthquake: Implications for Velocity Models and Regional Event Location

Gibbons, Steven J.; Antonovskaya, G. N.; Асминг, В. Э.; Konechnaya, Yana V.; Kremenetskaya, Elena; Kværna, Tormod; Schweitzer, Johannes; Vaganova, N. V.

doi:10.1785/0120150302

Cited by 14 publications

(4 citation statements)

References 34 publications

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“…The choice of this approach is driven by (1) a lack of knowledge about exhaustive and more complex velocity models covering the whole area, (2) to keep a coherent depth estimation that could be compared with other teleseismic studies (Craig et al 2011, ISC-EHB-L1 catalogue) and (3) to provide an homogeneous catalogue for the area. When available, using local velocity models instead would improve the depth estimation as shown by Jerkins et al (2020) and Gibbons et al (2016). Letort et al (2014), have also showed that a depth difference of 3-5 km could arise when using different models extracted the CRUST2.0 (Bassin et al 2000) instead of using ak135 velocity model.…”

Section: Validation Of the Cepstral Approach And Comparison With Isc-ehb L1 Events And Extraction Of Depth Resolution Criteriamentioning

confidence: 99%

Improving depth estimations of African earthquakes using teleseismic data, and influence for the East-African rift seismic hazard characterization

Gounon

Letort

Cotton

et al. 2021

Geophysical Journal International

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Summary Well-constrained earthquake depth estimations are important for seismic hazard determination. As local networks of the East-African Rift are usually too sparse for reliable depth estimations, we used detections of pP and sP phase arrivals (the so-called depth phases) at teleseismic distance to constrain earthquake depths in this region. We rely on a fully automatic Cepstral analysis approach (Letort et al., 2015), first validated at the global scale using the ISC-EHB catalogue, then applied on the East-African seismicity. We investigated 9575 earthquakes from magnitude 2 since 2005 which allows us to constrain the depth estimation of 584 events with magnitude mainly above 3.5, complemented by 139 reliable depth estimations from previous studies based on teleseismic data as well. To ensure a final catalogue as complete as possible, we also identified from regional catalogues 113 earthquakes assumed to be well constrained, based on network geometry empirical criteria. Thanks to this study, we finally propose new earthquake depth distributions for the seismic source zonation defined by Poggi et al. (2017), in order to estimate the seismic hazard of the East African Rift region. Including those new distributions in the source models leads to significant changes of seismic hazard assessments results.

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Section: Validation Of the Cepstral Approach And Comparison With Isc-ehb L1 Events And Extraction Of Depth Resolution Criteriamentioning

confidence: 99%

Improving depth estimations of African earthquakes using teleseismic data, and influence for the East-African rift seismic hazard characterization

Gounon

Letort

Cotton

et al. 2021

Geophysical Journal International

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“…These plots are a variant on the VESPA process (Davies et al, 1971) and allow us to confirm that each of the signals at the time of the predicted Parrival is associated with a coherent wave packet with a direction consistent with the origin hypothesis. Gibbons et al (2016) performed such analysis on several array stations for an earthquake of similar magnitude near the Northern tip of Novaya Zemlya in the Russian Arctic and found double bursts of coherent energy with a delay of just over 3 seconds at stations at di↵erent azimuths from the epicenter. This observation supported a hypothesis of teleseismic pP phases which helped to constrain the event depth.…”

Section: Overview Of the Seismological Observationsmentioning

confidence: 99%

Resolving the location of small intracontinental earthquakes using Open Access seismic and geodetic data: lessons from the 18 January 2017 mb 4.3 Tenere, Niger, earthquake

Craig¹,

Gibbons²

2022

Preprint

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A low-magnitude earthquake was recorded on January 18, 2017, in the T\'{e}n\'{e}r\'{e} desert in Niger. This intraplate region is exceptionally sparsely covered with seismic stations and the closest open seismic station, G.TAM in Algeria at a distance of approximately 600 km, was unusually and unfortunately not operational at the time of the event. Body-wave magnitude estimates range from $m_b 4.2$ to $m_b 4.6$ and both seismic location and magnitude constraints are dominated by stations at teleseismic distances. The seismic constraints are strengthened considerably by array stations of the International Monitoring System for verifying compliance with the Comprehensive Nuclear Test-Ban-Treaty. This event, with magnitude relevant to low-yield nuclear tests, provides a valuable validation of the detection and location procedure for small land-based seismic disturbances at significant distances. For seismologists not in the CTBT system, the event is problematic as data from many of the key stations are not openly available. We examine the uncertainty in published routinely-determined epicenters by performing multiple Bayesloc location estimates with published arrival times considering both all published arrival times and those from open stations only. This location exercise confirms lateral uncertainties in seismologically-derived location no smaller than 10 km. Coherence for InSAR in this region is exceptionally high, and allows us to confidently detect a displacement of the order 6 mm in the time-frame containing the earthquake, consistent with the seismic location estimates, and with a lateral length scale consistent with an earthquake of this size, allowing location constraint to within one rupture length ($\leq 5$ km) -- significantly reducing the lateral uncertainty compared with relying on seismological data only. Combining Open Access-only seismological and geodetic data, we precisely constrain the source location, and conclude that this earthquake likely had a shallow source. We then discuss potential ways to continue the integration of geodetic data in the calibration of seismological earthquake location.

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“…These plots are a variant on the VESPA process (Davies et al 1971) and allow us to confirm that each of the signals at the time of the predicted P arrival is associated with a coherent wave packet with a direction consistent with the origin hypothesis. Gibbons et al (2016) performed such analysis on several array stations for an earthquake of similar magnitude near the Northern tip of Novaya Zemlya in the Russian Arctic and found double bursts of coherent energy with a delay of just over 3 s at stations at different azimuths from the epicentre. This observation supported a hypothesis of teleseismic pP phases which helped to constrain the event depth.…”

Section: Ov E Rv I E W O F T H E S E I S M O L O G I C a L O B S E Rv...mentioning

confidence: 99%

Resolving the location of small intracontinental earthquakes using Open Access seismic and geodetic data: lessons from the 2017 January 18mb 4.3, Ténéré, Niger, earthquake

Craig,

Gibbons

2022

Geophysical Journal International

View full text Add to dashboard Cite

A low-magnitude earthquake was recorded on January 18, 2017, in the Ténéré desert in northern Niger. This intraplate region is exceptionally sparsely covered with seismic stations and the closest open seismic station, G.TAM in Algeria at a distance of approximately 600 km, was unusually and unfortunately not operational at the time of the event. Body-wave magnitude estimates range from mb4.2 to mb4.7 and both seismic location and magnitude constraints are dominated by stations at teleseismic distances. The seismic constraints are strengthened considerably by array stations of the International Monitoring System for verifying compliance with the Comprehensive Nuclear Test-Ban-Treaty. This event, with magnitude relevant to low-yield nuclear tests, provides a valuable validation of the detection and location procedure for small land-based seismic disturbances at significant distances. For seismologists not in the CTBT system, the event is problematic as data from many of the key stations are not openly available. We examine the uncertainty in published routinely-determined epicenters by performing multiple Bayesloc location estimates with published arrival times considering both all published arrival times and those from open stations only. This location exercise confirms lateral uncertainties in seismologically-derived location no smaller than 10 km. Coherence for InSAR in this region is exceptionally high, and allows us to confidently detect a displacement of the order 6 mm in the time-frame containing the earthquake, consistent with the seismic location estimates, and with a lateral length scale consistent with an earthquake of this size, allowing location constraint to within one rupture length (≤5 km) – significantly reducing the lateral uncertainty compared with relying on seismological data only. Combining Open Access-only seismological and geodetic data, we precisely constrain the source location, and conclude that this earthquake likely had a shallow source. We then discuss potential ways to continue the integration of geodetic data in the calibration of seismological earthquake location.

show abstract

The 11 October 2010 Novaya Zemlya Earthquake: Implications for Velocity Models and Regional Event Location

Cited by 14 publications

References 34 publications

Improving depth estimations of African earthquakes using teleseismic data, and influence for the East-African rift seismic hazard characterization

Improving depth estimations of African earthquakes using teleseismic data, and influence for the East-African rift seismic hazard characterization

Resolving the location of small intracontinental earthquakes using Open Access seismic and geodetic data: lessons from the 18 January 2017 mb 4.3 Tenere, Niger, earthquake

Resolving the location of small intracontinental earthquakes using Open Access seismic and geodetic data: lessons from the 2017 January 18mb 4.3, Ténéré, Niger, earthquake

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