Article
Geochemistry & Geophysics
E. Biondini, D. A. Rhoades, P. Gasperini
Summary: This article presents a study on earthquake prediction in Italy using the EEPAS forecasting model. By comparing different software codes and optimizing parameters, it is found that the EEPAS model has stronger predictive power in longer time intervals (6 months to 10 years).
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
P. Gasperini, E. Biondini, B. Lolli, A. Petruccelli, G. Vannucci
Summary: The study computed and predicted the relative frequencies of potentially destructive main shocks following strong shocks in Italy, demonstrating the effectiveness of the forecasting algorithm.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Marcus Herrmann, Warner Marzocchi
Summary: An ensemble model combines forecasts from different models or different versions of the same model into a single forecast. Previous methods usually weighted forecasts equally or based on individual skill. This study presents a more meaningful strategy by obtaining weights that maximize the skill of the ensemble. The approach uses multivariate logistic regression and allows flexibility to address different aspects of seismicity and end user needs.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
I Spassiani, G. Falcone, M. Murru, W. Marzocchi
Summary: In this paper, the authors gather and analyze the results of the OEF system in Italy during its first 10 years of operation. The system provides real-time earthquake forecasts for the entire Italian territory based on an ensemble model. The authors evaluate the performance of the forecasts using standard tests and performance measures borrowed from other fields. The study aims to identify weaknesses in the OEF-Italy modeling, provide helpful measures for stakeholders, and uncover features of seismic activity in Italy.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Kyungjae Im, Jean-Philippe Avouac
Summary: Earthquakes cluster due to stress transfer among faults or transient loading by aseismic slip events. Existing models like the ETAS model and the earthquake nucleation model explain different aspects of clustering but have limitations. A new Discrete Fault Network model based on rate-and-state friction successfully simulates realistic swarms, foreshocks, and aftershocks, highlighting the importance of fault zone complexity in seismicity patterns.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
J. A. Bayona, W. H. Savran, D. A. Rhoades, M. J. Werner
Summary: According to the research, using smoothed seismicity models can predict moderate-to-large earthquakes in California over a period of 5-15 years. However, current prediction models still struggle to explain the spatial patterns of earthquakes.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Eric Beauce, Piero Poli, Felix Waldhauser, Benjamin Holtzman, Christopher Scholz
Summary: The Earth's crust experiences oscillatory stress perturbations from the solid Earth and ocean tides. The seismic response to these stress modulations contains valuable information about earthquake physics and crustal properties. Through experimental and observational studies, it has been suggested that the strength of tidal modulation of seismicity increases before large earthquakes, and our research supports this hypothesis. By analyzing a comprehensive earthquake catalog leading up to the Ridgecrest earthquake in California on July 6th, 2019, we observed enhanced tidal sensitivity of seismicity along the fault approximately 1.5 years before the mainshock, providing new insights into the earthquake preparation process.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
A. M. Lombardi
Summary: This study examines three major seismic sequences in Italy and finds that the variability of the Gutenberg-Richter b-value may not be a reliable indicator of stress or a significant precursor in these examples. The findings suggest that chance, data inhomogeneities, and inefficiencies in estimation methodologies may contribute to the variability of the b-value.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Tomas Fischer, Sebastian Hainzl, Josef Vlcek
Summary: The hypocentres of earthquake swarms and injection-induced seismicity show systematic migration, and the origin of short episodes of rapid migration is still unclear. This study reviews possible triggering mechanisms and proposes a graphical method to distinguish internal and external triggering forces. Two models, the crack model and the rupture front model, are proposed to explain the spreading of hypocentres. An automatic algorithm is developed to detect fast migration episodes in seismicity data, and it is applied to earthquake swarms and injection-induced seismicity. The results show that fast migration episodes are relatively frequent during earthquake swarms, and the migration velocity is related to the duration of the episodes.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Behnam M. Asayesh, Hamid Zafarani, Sebastian Hainzl, Shubham Sharma
Summary: On November 12, 2017, a magnitude 7.3 earthquake occurred in the west of Iran near the Iraq border. Two large aftershocks of magnitude 5.9 and 6.3 followed about 9 and 12 months later, resulting in the 2017-2019 Kermanshah sequence. This study analyzes the sequence and its potential to forecast aftershock distribution, comparing different models and taking into account the impact of large secondary earthquakes. The results highlight the importance of considering secondary stress changes in improving earthquake forecasts.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
David L. Guenaga, Richard A. Alfaro-Diaz, Aaron A. Velasco
Summary: The state of Utah in the USA is seismically active and susceptible to earthquakes, with around 3800 catalogued earthquakes per year. Research shows that dynamic triggering events caused by global earthquakes with M ≥ 7 are sparse in Utah, accounting for less than 20% of the earthquakes that occurred from 2000 to the end of 2017, except for the Denali Fault (M7.9) earthquake in Alaska.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Kelian Dascher-Cousineau, Oleksandr Shchur, Emily E. Brodsky, Stephan Guennemann
Summary: Seismology is experiencing growth in earthquake catalogs in terms of diversity and scale, with the aim of improving earthquake forecasts. However, the introduction of a deep-learning model called RECAST based on neural temporal point processes shows promise in overcoming the limitations of traditional approaches and accurately modeling earthquake-like point processes from cataloged data. Tests on synthetic data and earthquake catalogs in Southern California demonstrate improved fit and forecast accuracy compared to benchmark models, making RECAST a flexible and scalable solution for earthquake forecasting.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Francesco Serafini, Mark Naylor, Finn Lindgren, Maximilian J. Werner, Ian Main
Summary: Selecting an optimal forecasting model for seismic sequences is crucial for operational earthquake forecasting. This study examines the performance of different metrics for comparing probabilistic seismicity forecasts and proves that the Parimutuel Gambling score is generally improper. Even in the special case where it is proper, it can still be used improperly. The study provides simulation techniques to assess the appropriateness of a score and compares the performance of the Parimutuel Gambling score with two commonly used proper scores. The findings suggest that the Parimutuel Gambling score should not be used to distinguish between multiple competing forecasts.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Sepideh J. Rastin, David A. Rhoades, Annemarie Christophersen
Summary: The EEPAS medium-term earthquake forecasting model is based on the precursory scale increase phenomenon and shows a trade-off between time and area as a second-order effect. By mixing multiple EEPAS models and exploiting this space-time trade-off, earthquake forecasting accuracy can be improved.
APPLIED SCIENCES-BASEL
(2021)
Article
Geochemistry & Geophysics
Asim M. Khawaja, Sebastian Hainzl, Danijel Schorlemmer, Pablo Iturrieta, Jose A. Bayona, William H. Savran, Maximilian Werner, Warner Marzocchi
Summary: This study aims to evaluate earthquake forecast models by using a grid-based format to express earthquake forecasts and assessing the spatial distribution of seismicity through the S-test. The study found that the high resolution grid and sparse earthquake distribution affect the statistical power, and recommends the use of Quadtree-based multi-resolution grids to improve the statistical power in future experiments.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
M. Staszek, B. Orlecka-Sikora, K. Leptokaropoulos, G. Kwiatek, P. Martinez-Garzon
GEOPHYSICAL RESEARCH LETTERS
(2017)
Article
Geochemistry & Geophysics
Beata Orlecka-Sikora, Szymon Cielesta, Stanislaw Lasocki
Article
Geochemistry & Geophysics
Szymon Cielesta, Beata Orlecka-Sikora, Monika Staszek, Pawel Urban, Dorota Olszewska, Elmer Ruigrok, Sam Toon, Matteo Picozzi, Grzegorz Kwiatek, Simone Cesca, Jose Angel Lopez Comino, Catherine Isherwood, Nelly Montcoudiol, Janusz Jaroslawski
Article
Geochemistry & Geophysics
Konstantinos Leptokaropoulos, Szymon Cielesta, Monika Staszek, Dorota Olszewska, Grzegorz Lizurek, Joanna Kocot, Stanislaw Lasocki, Beata Orlecka-Sikora, Mariusz Sterzel, Tomasz Szepieniec
Article
Geosciences, Multidisciplinary
Stanislaw Lasocki, Beata Orlecka-Sikora
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Multidisciplinary Sciences
Beata Orlecka-Sikora, Szymon Cielesta
SCIENTIFIC REPORTS
(2020)
Correction
Multidisciplinary Sciences
Beata Orlecka-Sikora, Szymon Cielesta
SCIENTIFIC REPORTS
(2020)
Correction
Multidisciplinary Sciences
Beata Orlecka-Sikora, Stanislaw Lasocki, Joanna Kocot, Tomasz Szepieniec, Jean Robert Grasso, Alexander Garcia-Aristizabal, Marc Schaming, Pawel Urban, Glenda Jones, Ian Stimpson, Savka Dineva, Piotr Salek, Konstantinos Leptokaropoulos, Grzegorz Lizurek, Dorota Olszewska, Jean Schmittbuhl, Grzegorz Kwiatek, Aglaja Blanke, Gilberto Saccorotti, Karolina Chodzinska, Lukasz Rudzinski, Izabela Dobrzycka, Grzegorz Mutke, Adam Baranski, Aleksandra Pierzyna, Elena Kozlovskaya, Jouni Nevalainen, Jannes Kinscher, Jan Sileny, Mariusz Sterzel, Szymon Cielesta, Tomas Fischer
Article
Multidisciplinary Sciences
Beata Orlecka-Sikora, Stanislaw Lasocki, Joanna Kocot, Tomasz Szepieniec, Jean Robert Grasso, Alexander Garcia-Aristizabal, Marc Schaming, Pawel Urban, Glenda Jones, Ian Stimpson, Savka Dineva, Piotr Salek, Konstantinos Leptokaropoulos, Grzegorz Lizurek, Dorota Olszewska, Jean Schmittbuhl, Grzegorz Kwiatek, Aglaja Blanke, Gilberto Saccarotti, Karolina Chodzinska, Lukasz Rudzinski, Izabela Dobrzycka, Grzegorz Mutke, Adam Baranski, Aleksandra Pierzyna, Elena Kozlovskaya, Jouni Nevalainen, Jannes Kinscher, Jan Sileny, Mariusz Sterzel, Szymon Cielesta, Tomas Fischer
Article
Geochemistry & Geophysics
Maria Kozlowska, Beata Orlecka-Sikora, Savka Dineva, Lukasz Rudzinski, Mirjana Boskovic
Summary: This study aims to estimate the rate and distribution of aftershocks following mining-induced seismic events using the rate-and-state model of fault friction commonly used in natural earthquake studies. It was found that the pre-mainshock level of seismicity and the coseismic stress change following the mainshock rupture have strong effects on the aftershock sequence. Additionally, the constantly changing stress state caused by ongoing exploitation must be considered for mining-induced seismicity.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Lukasz Rudzinski, Stanislaw Lasocki, Beata Orlecka-Sikora, Jan Wiszniowski, Dorota Olszewska, Jakub Kokowski, Janusz Mirek
Summary: The importance of high-quality open-access seismic data, overview of four seismic networks operating in Poland, and availability of data through the European Plate Observing System.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Energy & Fuels
Stanislaw Lasocki, Lukasz Rudzinski, Antek K. Tokarski, Beata Orlecka-Sikora
Summary: Hydrofracturing, used for shale gas exploitation, may induce felt, even damaging earthquakes. A study on an M(w)2.8 earthquake in Wysin, Poland, suggests that hydrofracturing could trigger seismic activity, even with a long lag time after the stimulation process.
Article
Geochemistry & Geophysics
Beata Orlecka-Sikora, Stanislaw Lasocki
PURE AND APPLIED GEOPHYSICS
(2017)
Article
Geochemistry & Geophysics
Maria Kozlowska, Beata Orlecka-Sikora
PURE AND APPLIED GEOPHYSICS
(2017)
Article
Geochemistry & Geophysics
K. M. Leptokaropoulos, E. E. Papadimitriou, B. Orlecka-Sikora, V. G. Karakostas
PURE AND APPLIED GEOPHYSICS
(2016)