Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 46905 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Modeling and simulating an aftershock process caused by a strong earthquake in the Barents Sea shelf Modeling and simulating an aftershock process caused by a strong earthquake in the Barents Sea shelf Baranov Sergey Baranov Sergey Kola Branch of Geophysical Survey of RAS, Apatity, Murmansk Region, Russia ru Kola Branch of Geophysical Survey of RAS, Apatity, Murmansk Region, Russia ru 12 1 1 9 10 11 2021 https://rjes.ru/en/nauka/article/46905/view

The paper considers an aftershock process caused by an Mw = 6.1 earthquake which occurred on 21 February 2008 in the Storfjord channel Spitsbergen). The earthquake was the strongest in the history of seismic monitoring on the Barents Sea shelf. To study the aftershock process, some relaxation models of aftershock decay rate and the Epidemic-type Aftershock-sequences ETAS model of triggered seismicity were fitted. It was shown that the aftershock process was a superposition of two subprocesses relaxation and trigger. Each of the subprocesses was simulated using a relevant model. Based on the modeling, a hypothesis of Storfjord seismicity connected with fluid effect on the local stress field was suggested.

The paper considers an aftershock process caused by an Mw = 6.1 earthquake which occurred on 21 February 2008 in the Storfjord channel Spitsbergen). The earthquake was the strongest in the history of seismic monitoring on the Barents Sea shelf. To study the aftershock process, some relaxation models of aftershock decay rate and the Epidemic-type Aftershock-sequences ETAS model of triggered seismicity were fitted. It was shown that the aftershock process was a superposition of two subprocesses relaxation and trigger. Each of the subprocesses was simulated using a relevant model. Based on the modeling, a hypothesis of Storfjord seismicity connected with fluid effect on the local stress field was suggested.

 Aftershock process model of aftershock decay rate ETAS model aftershock process simulating Spitsbergen Aftershock process model of aftershock decay rate ETAS model aftershock process simulating Spitsbergen

Asming, The improved algorithm of automatic detection and location of earthquakes by a single seismic array and its application for study of aftershock sequence in the Spitsbergen archipelago, Seismic Instruments, v. 46, no. 2, 2010. Asming, The improved algorithm of automatic detection and location of earthquakes by a single seismic array and its application for study of aftershock sequence in the Spitsbergen archipelago, Seismic Instruments, v. 46, no. 2, 2010. Baranov, Earthquake of 21.02.2008 in Storfjord, Spitsbergen, All-Russian Conference ``Northern territories of Russia: problems and development perspectives'', 2008. Baranov, Earthquake of 21.02.2008 in Storfjord, Spitsbergen, All-Russian Conference ``Northern territories of Russia: problems and development perspectives'', 2008. Benioff, Earthquakes and rock creep: Part I: Creep Characteristics of Rocks and The Origin of Aftershocks), Bulletin Bull. Seism. Soc. Am., v. 41, no. 1, 1962. Benioff, Earthquakes and rock creep: Part I: Creep Characteristics of Rocks and The Origin of Aftershocks), Bulletin Bull. Seism. Soc. Am., v. 41, no. 1, 1962. Bungum, Concentrated earthquake zones in Svalbard, Tectonophysics, v. 82, 1982. Bungum, Concentrated earthquake zones in Svalbard, Tectonophysics, v. 82, 1982. Crane, Thermal implications for the evolution of the Spitsbergen transform fault, Tectonohysics, v. 89, 1982. Crane, Thermal implications for the evolution of the Spitsbergen transform fault, Tectonohysics, v. 89, 1982. Daley, A summary of the theory of point processes. In Stochastic Point Processes: Statistical Analysis, Theory and Applications, 1972. Daley, A summary of the theory of point processes. In Stochastic Point Processes: Statistical Analysis, Theory and Applications, 1972. Evdokimov, Spitsbergen Volcanoes, 2000. Evdokimov, Spitsbergen Volcanoes, 2000. Fischer, Slip-generated patterns of swarm microearthquakes from West Bohemia/Vogtland central Europe): Evidence of their triggering mechanism?, J. Geophys. Res., v. 110, no. B05s21, 2005., doi: 10.1029/2004JB003363 Fischer, Slip-generated patterns of swarm microearthquakes from West Bohemia/Vogtland central Europe): Evidence of their triggering mechanism?, J. Geophys. Res., v. 110, no. B05s21, 2005., doi: 10.1029/2004JB003363 Gross, Tests of models of aftershock rate decay, Bull. Seism. Soc. Am., v. 84, no. 5, 1994. Gross, Tests of models of aftershock rate decay, Bull. Seism. Soc. Am., v. 84, no. 5, 1994. Hainzl, Detecting fluid signals in seismicity data through statistical earthquake modeling, J. Geophys. Res., v. 110, 2005., doi: 10.1029/2004JB003247 Hainzl, Detecting fluid signals in seismicity data through statistical earthquake modeling, J. Geophys. Res., v. 110, 2005., doi: 10.1029/2004JB003247 Hutorskoy, Abnormal heat flow and nature of valleys in North part of Svalbard plate, Dokl. Akad. Nauk, v. 424, no. 2, 2009. Hutorskoy, Abnormal heat flow and nature of valleys in North part of Svalbard plate, Dokl. Akad. Nauk, v. 424, no. 2, 2009. Kisslinger, The Stretched Exponential Function as an Alternative Model for Aftershock Decay Rate, J. Geophys. Res., v. 98, no. B2, 1993. Kisslinger, The Stretched Exponential Function as an Alternative Model for Aftershock Decay Rate, J. Geophys. Res., v. 98, no. B2, 1993. Leonard, Bayesian Methods, An analysis for statisticians and interdisciplinary researchers, 1999. Leonard, Bayesian Methods, An analysis for statisticians and interdisciplinary researchers, 1999. Lewis, Simulation of Non-homogeneous Poisson Processes by Thinning, Naval Res. Logistics Quart., v. 26, 1979. Lewis, Simulation of Non-homogeneous Poisson Processes by Thinning, Naval Res. Logistics Quart., v. 26, 1979. Liptzer, Statistics of Random Processes. II. Applications, 2000. Liptzer, Statistics of Random Processes. II. Applications, 2000. Michael, Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel Ridge, Arctic Ocean, Nature, v. 423, 2003. Michael, Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel Ridge, Arctic Ocean, Nature, v. 423, 2003. Narteau, Temporal limits of the power law aftershock decay rate, J. Geophys. Res., v. 107, no. B12, 2002., doi: 10.1029/2002JB001868 Narteau, Temporal limits of the power law aftershock decay rate, J. Geophys. Res., v. 107, no. B12, 2002., doi: 10.1029/2002JB001868 Ogata, Seismicity Analysis through Point-process Modeling: A Review, Pure Appl. Geophys., v. 155, 1999. Ogata, Seismicity Analysis through Point-process Modeling: A Review, Pure Appl. Geophys., v. 155, 1999. Ogata, Fast likelihood computation of Epidemic Type Aftershock-Sequence Model, Geophys. Res. Lett., v. 20, no. 19, 1993. Ogata, Fast likelihood computation of Epidemic Type Aftershock-Sequence Model, Geophys. Res. Lett., v. 20, no. 19, 1993. Panasenko, Earthquake of Spitsbergen, 1987. Panasenko, Earthquake of Spitsbergen, 1987. Pirly, Preliminary Analysis of the 21 February 2008, Svalbard Norway), Seismic Sequence, Seism. Res. Lett., v. 81, no. 1, 2010. Pirly, Preliminary Analysis of the 21 February 2008, Svalbard Norway), Seismic Sequence, Seism. Res. Lett., v. 81, no. 1, 2010. Sholz, Microfractures, aftershocks, and seismicity, Bull. Seismol. Soc. Am., v. 58, 1978. Sholz, Microfractures, aftershocks, and seismicity, Bull. Seismol. Soc. Am., v. 58, 1978. Spichak, Possible role of fluids in the process of earthquake swarm generation in West Bohemia/Vogland seismoactive region, Tectonophysics, v. 336, 2001. Spichak, Possible role of fluids in the process of earthquake swarm generation in West Bohemia/Vogland seismoactive region, Tectonophysics, v. 336, 2001. Utsu, A statistical study on the occurrence of aftershocks, Geoph. Magazine, v. 30, 1961. Utsu, A statistical study on the occurrence of aftershocks, Geoph. Magazine, v. 30, 1961. Weise, Transport of mantle volatiles through the crust traced by seismically release fluids: a natural experiment in the earthquake swarm area Vogland/NW Bohemia, Central Europe, Tectonophysics, v. 336, 2001. Weise, Transport of mantle volatiles through the crust traced by seismically release fluids: a natural experiment in the earthquake swarm area Vogland/NW Bohemia, Central Europe, Tectonophysics, v. 336, 2001. Yakovlev, Simulation-Based Distributions of Earthquake Recurrence Times on the San Andreas Fault System, Bull. Seism. Soc. Am., v. 96, no. 6, 2006. Yakovlev, Simulation-Based Distributions of Earthquake Recurrence Times on the San Andreas Fault System, Bull. Seism. Soc. Am., v. 96, no. 6, 2006.