Article
Geosciences, Multidisciplinary
Suchi Rahmadani, Irwan Meilano, Susilo Susilo, Dina A. Sarsito, Hasanuddin Z. Abidin, Pepen Supendi
Summary: The Banda Arc region is characterized by crustal shortening caused by the interaction of the Australian, Pacific, and Philippine Sea plates. Areas with high strain rates have experienced significant seismicity, and the ratio of geodetic moment rate to seismic moment rate suggests a moment deficit rate equivalent to an earthquake potential of M-w 7.7-8.1.
GEOMATICS NATURAL HAZARDS & RISK
(2022)
Article
Geochemistry & Geophysics
Prabhat Kumar, Javed N. N. Malik, Vineet K. K. Gahalaut, Rajeev K. K. Yadav, Gurvinder Singh
Summary: The Himachal region in the Northwest Himalaya displays significant strain partitioning along the faults and exhibits oblique convergence rates. Continuous GPS measurements show a convergence rate of 16.5 +/- 1.1 mm/yr in the arc-normal direction and 4-5 mm/yr in the arc-parallel direction. The Main Himalayan Thrust (MHT) shows variation in coupling and suggests the presence of a potentially active segment of MBT along the southern margin of Dhauladhar ranges.
Article
Geochemistry & Geophysics
James Broermann, Richard A. Bennett, Corne Kreemer, Geoffrey Blewitt, Philip A. Pearthree
Summary: Rates of crustal deformation in the southern Basin and Range (SBR) and Colorado Plateau (CP) provinces are relatively low but can lead to large earthquakes due to the accumulation of strain over time. It is difficult to quantify deformation rates in these regions, but analysis has shown an anomalous high strain rate in southwestern Arizona, possibly due to unmodeled Pacific-North America plate boundary strain seeping into the study area.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Eduardo R. Diez Zaldivar, Enrico Priolo, Denis Sandron, Viana Poveda Brossard, Marco Cattaneo, Simone Marzorati, Raul Palau Clares
Summary: The detection level of a seismic network, which measures its ability to record small earthquakes, can be influenced by various factors. In this study, the detection level of the Cuban seismic network is determined by predicting the signal amplitude of seismic events at individual stations using estimated seismic noise spectral level and theoretical relationships. The analysis provides insights into areas for network improvement and sets a magnitude threshold for the Cuban earthquake catalog in 2020.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Adebayo Oluwaseun Ojo, Honn Kao, Yan Jiang, Michael Craymer, Joseph Henton
Summary: This study analyzed seismic and geodetic data sets to estimate the crust strain accumulation and release rate by earthquakes in Canada, finding that a large portion of accumulated strain is not released by earthquakes due to glacial isostatic adjustment. The study also suggests that earthquake recurrence intervals vary significantly across different regions in Canada.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Construction & Building Technology
Eunjong Yu, Taewan Kim, Ji-Hun Park
Summary: Steel intermediate moment frames (SIMFs) with column-tree connections have the advantage of reducing steel usage by distributing seismic lateral loads throughout the frame, but concerns about slip at the beam splice and concentrated deformation in weak panel zones remain. However, a numerical study showed that in SIMFs with column-tree connections, energy absorption is shared between beams and panel zones, reducing deformation concentration in weak panel zones. Improved data quality and modeling can further reduce the collapse probability of SIMFs with column-tree connections to levels comparable to those with conventional connections.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Civil
Hammad El Jisr, Mohsen Kohrangi, Dimitrios G. Lignos
Summary: This paper proposes a macro-model for simulating the hysteretic behavior of composite-steel beams in fully restrained beam-to-column connections in composite-steel moment-resisting frames. The model captures the asymmetric hysteretic response and the slip demands in beam-slab connections. Evaluation of European composite-steel MRF buildings shows low collapse probability and minimal damage for frequently occurring seismic events.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2022)
Article
Geosciences, Multidisciplinary
Angel Cibeira Urtiaga, Manuel Berrocoso, Belen Rosado, Antonio Pazos
Summary: The introduction of GPS has provided a new method for measuring surface displacements caused by earthquakes. By analyzing GPS network data in Japan, we studied the 2011 Tohoku-Oki earthquake and identified the time of earthquake impact and the time of maximum displacements. These parameters help in understanding the earthquake and its propagation.
EARTH SCIENCES RESEARCH JOURNAL
(2022)
Article
Geochemistry & Geophysics
Jeremy Maurer, Kathryn Materna
Summary: Geodetic velocity data are used to estimate crustal surface strain rates, which are important for seismic hazard assessment. However, since geodetic data are spatially scattered, interpolation is needed to estimate strain rates everywhere. This study compares different interpolation methods for strain rate estimation using Global Navigation Satellite System (GNSS) data in southern California, and investigates the sources of variability in inferred strain rates. The results highlight the influence of parameter choices and suggest using the L-curve approach for quantifying the trade-off between data fit and reflective models. The study also introduces an open-source Python package, Strain_2D, for calculating strain rates.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Yuehua Zeng
Summary: A fault-based crustal deformation model is used to estimate long-term on-fault slip rates and off-fault moment rate distribution. The model connects major fault segments and uses inputs from GPS velocities and geologic slip-rate constraints. After applying a time-dependent correction, the discrepancies between model slip rates and geologic slip rates are reduced. The off-fault moment rate distribution is consistent with regional tectonics and seismicity patterns.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Fred F. Pollitz, Eileen L. Evans, Edward H. Field, Alexandra E. Hatem, Elizabeth H. Hearn, Kaj Johnson, Jessica R. Murray, Peter M. Powers, Zheng-Kang Shen, Crystal Wespestad, Yuehua Zeng
Summary: This report describes the geodetic and geologic information used to constrain deformation models for the 2023 update to the National Seismic Hazard Model (NSHM). It discusses the implications of these models on earthquake rates in the western United States. The report emphasizes the importance of both geologic and geodetic slip rates to inform the earthquake rate model.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Astronomy & Astrophysics
Yi Chai, Shuanggen Jin
Summary: The study detected co-seismic ionospheric disturbances (CIDs) about 12 minutes after the M-w 7.7 Jamaica earthquake on January 28, 2020, providing insights on the coupled nature of earthquake-atmosphere geophysical processes. Significant CIDs were observed in the south near-field area and southwest far-field area, with CID characteristics analyzed in terms of amplitude, elevation and azimuth angle, waveform, and frequency domain. The results confirmed that strike-slip earthquakes can generate pronounced co-seismic ionospheric disturbances.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Geochemistry & Geophysics
Bahruz Ahadov, Shuanggen Jin
Summary: This study focuses on the Eastern Mediterranean and Caucasus regions to investigate plate motions, regional deformation, and fault slip rates using a new elastic block model. The research reveals the estimated slip rates and locking depths along major faults, providing insights into earthquake hazards in the area.
PURE AND APPLIED GEOPHYSICS
(2021)
Article
Environmental Sciences
Li Yan, Yanling Sun, Meng Li, Ahmed El-Mowafy, Lei Ma
Summary: Slow slip events (SSEs) are geophysical phenomena that occur primarily in subduction zones and are often associated with seismic activity. In this study, SSEs and seismic activity in New Zealand's North Island were investigated. The results showed that SSE1 and SSE7 had larger cumulative slips and surface displacements, leading to a noticeable increase in seismic frequency. The other six SSEs, although characterized by smaller slips, also resulted in an upward trend in seismic frequency in their respective main slip regions. Monitoring shallow SSEs may contribute to identifying and recording seismic activity.
Article
Construction & Building Technology
Raffaele Landolfo
Summary: EQUALJOINTS and EQUALJOINTS-Plus are two European projects aimed at developing seismic prequalification procedures for commonly used beam-to-column joints in the EU practice. Experimental tests, numerical simulations, and analytical investigations were conducted to develop design tools and prequalification charts, which were disseminated through workshops and seminars.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Geochemistry & Geophysics
Vineet K. Gahalaut, Kalpna Gahalaut, Rakesh K. Dumka, Pallabi Chaudhury, Rajeev K. Yadav
Article
Geosciences, Multidisciplinary
Naveen Kumar, Kapil Mohan, Rakesh K. Dumka, Sumer Chopra
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2020)
Article
Geography, Physical
Harish Bisht, Bahadur Singh Kotlia, Kireet Kumar, Rakesh Kumar Dumka, Ajay Kumar Taloor, Rajeev Upadhyay
Summary: This study used GPS stations to track the velocity and direction of the Indian plate, showing it is moving towards the northeast with higher movement towards the eastward direction. The central part of the Himalaya region has the highest strain rate, indicating higher earthquake vulnerability.
QUATERNARY INTERNATIONAL
(2021)
Article
Geography, Physical
Rakesh K. Dumka, Donupudi SuriBabu, Ajay Kumar Taloor, Sandip Prajapati, B. S. Kotlia
Summary: This study analyzed the behavior of Total Electron Content (TEC) in the Ionosphere using GPS data from western India between 2009 and 2017. The results showed maximum TEC values during the daytime and a close relationship between sunspot numbers and TEC values. Seasonal variations were also observed in the TEC values for all years.
QUATERNARY INTERNATIONAL
(2021)
Article
Geography, Physical
Ajay Kumar Taloor, Lalit Mohan Joshi, Bahadur Singh Kotlia, Akhtar Alam, Girish Ch Kothyari, Raj Sunil Kandregula, Anoop Kumar Singh, Rakesh Kumar Dumka
Summary: The Mandakini and Bhilangana basins in the Garhwal Himalaya are facing unprecedented damage to life, property, and infrastructure due to torrential rains, landslides, and seismic activity. The landscape in response to episodic tectonic uplift and monsoon precipitation has been shown to affect the region's geomorphology and increase vulnerability to hazards threatening human lives. The study highlights the active nature of the Chail/Ramgarh thrust along the Balganga valley, as well as the impact of flooding during heavy rainfall events on river deposits and settlements.
QUATERNARY INTERNATIONAL
(2021)
Article
Engineering, Aerospace
Girish Ch Kothyari, Neha Joshi, Ajay Kumar Taloor, Kapil Malik, Rakesh Dumka, S. P. Sati, Y. P. Sundriyal
Summary: This study estimates the active surface deformation, displacement pattern, and erosional variability using the geomorphologically sensitive morphometry and the PSInSAR technique. The results show that the Raunthi River catchment is undergoing subsidence and uplift, leading to high erosion in the Raunthi River sub-basin. The study refutes the notion that temperature rise was the major trigger for the recent disaster, but suggests that sheared lithology and preexisting fissures played a key role. It calls for detailed investigation in glacial and paraglacial regions of the Himalayas.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Khayingshing Luirei, Girish Ch Kothyari, Rakesh K. Dumka, Surendra S. Bhakuni
Summary: The study area in Arunachal Himalaya is influenced by Main Boundary Thrust (MBT) and Himalayan Frontal Thrust (HFT), with complex geological structures and active tectonic movements. Various fault structures and deformation patterns were observed, highlighting the significance of accurate analysis of geological faults and structural deformations in the region for understanding seismic activities.
GEOLOGICAL JOURNAL
(2022)
Article
Environmental Sciences
Rakesh K. Dumka, D. Suribabu, Sandip Prajapati
Summary: Urban ground subsidence has become a danger to infrastructure and society, with significant subsidence observed in Ahmedabad, India. The study utilized different techniques like PSI, GNSS, and groundwater analysis to reveal the extent of subsidence in the city. The results from various data analyses corroborate each other, highlighting the seriousness of the issue.
GEOCARTO INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Rakesh K. Dumka, D. SuriBabu, B. S. Kotlia, Girish Ch. Kothyari, Sandip Prajapati
Summary: This paper investigates the geodynamic characteristics of the Narmada Son Lineament (NSL) by processing and analyzing GPS data from 2009 to 2016. The study reveals that the western NSL experiences maximum deformation at a rate of 1.6 mm per year, with a maximum seismic moment equivalent to a magnitude 6.0 earthquake. Additionally, the study highlights the significance of the Aravalli and Satpura mobile belts.
GEODESY AND GEODYNAMICS
(2022)
Article
Geochemistry & Geophysics
Naveen Kumar, Rakesh K. Dumka, Kapil Mohan, Sumer Chopra
Summary: The present study applies geomorphic analysis to evaluate the relative index of active tectonics in the Damanganga watershed. Based on the evaluation of various indices, the degree and gradation of tectonic activities in the study area are outlined, which is well supported by the geomorphic evidence.
GEODESY AND GEODYNAMICS
(2022)
Review
Geochemistry & Geophysics
Girish Ch. Kothyari, Raj Sunil Kandregula, Rakesh Dumka, Gaurav Chauhan, Ajay Kumar Taloor
Summary: The research aims to investigate the relationship between strain build-up, earthquake provenance, and landform evolution in the Quaternary deposits of the Kachchh Rift Basin (KRB). The analysis of accessible data and geochronology from previous studies, along with new dataset, provides insights into the Quaternary tectonic forces in the KRB. The study highlights the variability in uplift rates across active faults and suggests a complex geological history during the Quaternary period.
GEODESY AND GEODYNAMICS
(2022)
Article
Geochemistry & Geophysics
Donupudi Suribabu, Rakesh K. Dumka, Joydeep Paikray, Girish Ch. Kothyari, Mahesh Thakkar, Kandadai V. Swamy, Ajay K. Taloor, Sandip Prajapati
Summary: This study utilizes the Global Navigation Satellite System to investigate the deformation pattern in the central mainland Kachchh. The results show higher deformation rate and compressive strain in the eastern segment, indicating significant seismic hazard in this area.
GEODESY AND GEODYNAMICS
(2022)
Article
Geosciences, Multidisciplinary
Girish Ch. Kothyari, Kapil Malik, Rakesh K. Dumka, Sambit Prasanajit Naik, Rajib Biswas, Ajay Kumar Taloor, Khayingshing Luirei, Neha Joshi, Raj Sunil Kandregula
Summary: The co-seismic deformation of the 28th April 2021 Assam earthquake has been investigated using PSInSAR and validated with GPS. Due to atmospheric noise, the coseismic deformation was not visible, but the Sentinel-1 time-series data and APS processing were used to minimize the noise effect. The analysis revealed minor changes and subsidence in the affected areas, confirmed by liquefaction features and ground cracks. The GPS re-analysis showed significant deformation associated with Bomdila Fault and Jorhat Fault, indicating compressional strain in the BF zone and extensional strain in the KF zone. The earthquake was primarily associated with the BF.
JOURNAL OF APPLIED GEOPHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Rakesh K. Dumka, Sandip Prajapati, Donupudi SuriBabu, Kandadai Swamy, Girish Ch Kothyari, Kapil Malik
Summary: Based on nearly a decade of GPS data, the geodetic investigation of the Kachchh Rift Basin (KRB) in western India reveals regional compressive stress and the existence of strike-slip and thrust motion. The geological observations corroborate the measurement model.
GEOLOGICAL JOURNAL
(2023)
Article
Geochemistry & Geophysics
Naveen Kumar, Kapil Mohan, Rakesh K. Dumka, Sumer Chopra
JOURNAL OF INDIAN GEOPHYSICAL UNION
(2020)
