Journal of Seismology
Papers 1464
1 page of 147 pages (1,464 results)
Non-linear inverse problems arising in seismology are usually addressed either by linearization or by Monte Carlo methods. Neither approach is flawless. The former needs an accurate starting model; the latter is computationally intensive. Both require careful tuning of inversion parameters. An additional challenge is posed by joint inversion of data of different sensitivities and noise levels such as receiver functions and surface wave dispersion curves. We propose a generic workflow that combin...
This study presents seismic hazard and seismic microzonation maps for the Abbottabad basin and surroundings, which are used in assessment and seismic design of buildings and bridges and other infrastructures. This research work determines microzonation parameters (shear wave velocity, fundamental frequency, and acceleration on ground surface) using geotechnical and geophysical testing procedures. Standard penetration test (SPT) and H/V methods are used to characterize the soils by estimating she...
The effects of impedance and shape-ratio of large basin on the nature of occurrence of 2D resonance, spectral amplifications, sub-basin-induced Love (SBIL)-waves and sub-basin-transduced Love (SBTL)-waves and associated differential ground motion (DGM) across the sub-basin of the basin-sub-basin models are documented in this paper. The analysis of SH-wave responses of the considered small basin, large basin, and various basin-sub-basin models reveals that the presence of large basin does not cha...
The 2015 Gorkha Earthquake was a humanitarian disaster but also a cultural catastrophe that damaged and destroyed historic monuments across Nepal, including those within the Kathmandu Valley UNESCO World Heritage Property. In the rush to rebuild, traditionally constructed foundations are being removed and replaced with modern materials without assessments of whether these contributed to the collapse of a monument. Generally undertaken without scientific recording, these interventions have led to...
A revised comprehensive catalog has been made for earthquakes that occurred in northern European Russia for the period between 2005 and 2017. The earthquake parameters were determined to greater accuracy using the same velocity model (BARENTS), the same location method (based on generalized beamforming), combining data from catalogs, bulletins, and (in part) from waveform supplied by regional seismograph networks in Russia and the Scandinavian countries. The resulting unified catalog formed a ba...
Underground fluid injection and extraction is able to change pore fluid pressure at depth and make faults unstable, due to friction-force reduction, with an increased possibility of triggering earthquakes. Studying the local seismicity, down to microearthquakes, and stress field in areas where such activities are developed are essential steps to discriminate between natural and induced events. In this context, the moment magnitude (MW) is a key-parameter to both evaluate the energy balance and t...
#2Laurentiu Danciu (Swiss Seismological Service)H-Index: 13
Nomograms are an easy-to-use and visually-attractive graphical tool to solve for any of the variables within an often complex equation. In seismology the most well-known nomogram is a three-parallel-scale graphic for the calculation of local magnitude given the epicentral distance and trace amplitude. Until the advent of computers, nomograms were often employed by engineers and scientists in many fields as they provide a means for rapid and accurate calculations as well as helping the user under...
Experimental data pertaining to weak faults requires construction of microscopic models of the earthquake sources. This study proposes a new high-energy mechanism of transformation of potential energy of strata, saturated with free or bounded fluids, into a kinetic energy of motion of rocks. The proposed approach relies within the framework of classic statistical theory. The high-energy phenomena at a nanometer level are generated by self-consistent molecular fields acting on individual particle...
Amplification factor is defined as the ratio of the spectral acceleration at the soil surface to the spectral acceleration at bedrock in various periods. The effects of site conditions at the time of the earthquake are often estimated by amplification factor. Site amplification models are empirical relations to predict the amplification factor based on site characteristics. These models are used in ground motion prediction equations (GMPEs). In most models, the average shear wave velocity to the...
Top fields of study
Magnitude (mathematics)
Seismic hazard
Induced seismicity