Site effects primarily depend on the shear modulus of subsurface layers, and this is generally estimated from measured wave velocity (Vs) assumed density. Very rarely, densities are for amplification estimation because drilling sampling processes time consuming expensive. In study, an attempt has been made to derive correlation between density (dry wet density) Vs/SPT (standard penetration test) N values using data. A total 354 Vs data sets 364 SPT value 23 boreholes have used in study....

Mankind is vulnerable to artificial seismic sources and accompanying explosions' consequences. Recently, seismicity catalog contamination among the main problems faced by seismologists. Since identifying first always challenging stage, it imperative develop an automated control system that will discriminate tectonic from non-tectonic events. Detection removal of have become urgent. Early treatments cleaning contaminated catalogs are crucial assist in accurate hazard identification enhance...

Ground vibrations caused by blasting operations in cement canisters is among the main mining issues that cause significant disruptions to nearby buildings and infrastructure. This research was performed a limestone quarry situated southeast of Helwan City, Egypt, investigate impact ground motion vibration due blast action rocks. To reduce environmental blasting, continuous monitoring, accurate medium's peak particle velocity (PPV) assessment are required. Recently, machine learning (ML)...

Efficient handling and planning for the urban regions' sustainable development require a vast range of up-to-date thematic information. Besides, obtaining an uncontaminated catalog seismic activity is desirable to study earthquake (EQ) clusters' spatial allocation, which key role in mitigating hazards alleviating EQ losses by enhancing assessment hazards. This article considers northeastern part Egypt where seismicity contaminated quarry blasts (QBs) operated throughout mapped area....

Quiescent faults may be capable of creating catastrophic earthquakes in locations with moderate and/or low seismic activity, such as Egypt. This study combines structural, remote sensing (RS), geophysical, and activity data to examine analyze the relationship between tectonic structures seismotectonic In a new seismo-lineaments map Egypt, lineaments Egyptian mainland were delineated classified. The database contains 8000 that divided into distinct geographical zones using statistical...

Effective management and planning for sustainable urban regions' development require up-to-date information. Natural hazard maps (NHMs) creation is critical development. Urban areas along the western coast of Saudi Arabia are susceptible to natural disasters due their sources' proximity, especially, with lack preparation. Yanbu' Al-Bahr, a major Red Sea port, provides an excellent example. This research aims combine NHMs into single multi-hazard map, allowing acceptable site identification...

Abstract Attenuation characteristics have been estimated to understand the effect of heterogeneity in tectonically active Aswan Reservoir, southern part Egypt using data collected by a ten-station local seismological network operating across reservoir. The quality factor was from 350 waveform spectra P- and S-waves 50 earthquakes. By applying spectral ratio technique bandpass-filtered seismograms, obtained results show variations both P-waves attenuation ( $$Q_\alpha$$ <mml:math...

Investigations made to evaluate the site-effect characteristics and develop a reliable site classification scheme have received paramount importance for urban areas planning site-specific seismic hazard assessment. This paper presents novel non-objective data-driven approach preliminary maps using machine learning (ML) based on affinity propagation (AP) along with selected set of representative horizontal vertical spectral ratio (HVSR) curves inside King Saud University (KSU) campus, which...

Abstract The Red Sea region, situated between the Arabian and African Plates, experiences significant seismic activity due to its tectonic dynamics, with earthquakes ranging from minor potentially destructive events. This study aims develop smoothed seismicity models for region by using an enhanced catalog specific Sea. facilitates a detailed spatial temporal analysis of events, focusing on source characterization essential probabilistic hazard assessments. A rigorous declustering method...

A comprehensive geostatistical analysis was conducted on a dataset comprising 24,321 seismic events in the Red Sea region, spanning from 1997 to 2020. This involved creation of new activity database, incorporating data both Egyptian and Saudi Seismic Networks. enriched database provided robust foundation for detailed examination patterns activities region. Utilizing geographic information systems various spatial analytic methods, it identifies tectonic influences. The findings reveal...

Abstract. Peak ground acceleration (PGA) and study area (SA) distribution for the Patna district are presented considering both classical zoneless approaches through a logic tree framework to capture epistemic uncertainty. Seismicity parameters calculated by completed mixed earthquake data. Maximum magnitude is using three methods, namely incremental method, Kijko regional rupture characteristics approach. The best suitable motion prediction equations (GMPEs) selected carrying out an...

Abstract Well-recorded earthquakes located along the rift axis of Red Sea, western Saudi Arabia, were investigated. These events are among most significant recorded between 1997 and 2024 in this seismic zone. The moment tensor inversion, using full waveform data, was applied to determine rifting mechanism parameters investigated earthquakes. optimum double-couple for revealed normal faulting with minor strike slip movement red sea spreading axis. recent felt nearby cities, prompting a study...

Seismic hazard analysis provides an estimation of seismic parameters like peak ground acceleration (PGA) or spectral (SA) for different periods. The extent shaking and the values at a particular region are estimated using ground-motion prediction equations (GMPEs)/attenuation equations. There several GMPEs applicable to estimate PGA SA values. These may result in higher lower than specific reported values, which based on involved development GMPEs. In this study, attempt has been made...

Empirical relationships between the macroseismic intensity and ground-motion parameters for Himalayan region are derived in this study. A strong-motion database from 21 moderate-to-large earthquakes, along with their corresponding intensity, is considered. All values inferred isoseismal maps earthquake damage reports then converted to modified Mercalli (MMI) scale. An orthogonal regression analysis used find best correlation MMI peak ground acceleration (PGA), velocity (PGV), pseudospectral...

Rayleigh waves often propagate according to complex mode excitation so that the proper identification and separation of specific modes can be quite difficult or, in some cases, just impossible. Furthermore, analysis a single component (i.e., an inversion procedure based on one objective function) necessarily prevents solving problems related non-uniqueness solution. To overcome these issues define holistic waves, we implemented acquire data are useful efficiently invert three functions...