Parametric study of the seismic response of a hill or mountain

Resonant amplified seismic response within a hill or mountain

We show theoretically what is meant by the term '(surface shape) resonance' in connection with the seismic response of a protuberance (emerging from flat ground) such as a hill or mountain of arbitrary shape. We address the specific problem of cylindrical protuberances of rectangular shape submitted to a SH plane wave. We find that the principal (i.e., qualitative) characteristics of the seismic response of a mountain are quite similar to those of a hill, and that the occurrence of significative amplification of the displacement field within these structures is due to the coupling of the incid…

山体共振塑造地震诱发滑坡的分布

Mountain resonance shapes the distribution of earthquake-induced landslides

研究揭示山体共振频率影响地震诱发滑坡的发生、分布和规模，为滑坡灾害评估提供新机制。

Silence measurements and measures for ET: characterisation of long term seismic noise in the Mátra Mountains

The analysis of long term seismological data collected underground in the Mátra Mountains, Hungary, using the facilities of the Mátra Gravitational and Geophysical Laboratory (MGGL) is reported. The laboratory is situated inside the Gyöngyösoroszi mine, Hungary, 88m below the surface. This study focuses on the requirements of the Einstein Telescope (ET), one of the planned third generation gravitational wave observatories, which is designed for underground operation. After a short introduction of the geophysical environment the evaluation of the collected long term data follows including the c…

Estimation of cosmic-muon flux attenuation by Monserrate Hill in Bogota

When designing an experimental setup for measuring the flux of cosmic ray muons through a geological structure, it is crucial to make detailed estimates about the expected muon flux attenuation by the structure studied. In this way, the coverage area of the detectors, the data acquisition system and the time length of data taking can be planned accordingly to the aimed accuracy of the measurements. We present here a computational study of the cosmic muon flux at the location of Monserrate Hill in Bogota, Colombia, using the CORSIKA cosmic ray simulator. We use ArcGIS package to estimate the me…

A conservation law for testing methods of prediction of the seismic wave response of a protuberance emerging from flat ground

We establish the equations which translate a conservation law for the problem of the seismic response of an above-ground structure (e.g., building, hill or mountain) of arbitrary shape and inquire whether both the implicit (formal) and explicit (numerical) solutions for the response obey this law for the case of a cylindrical, rectangular protuberance. Both the low-order (poor approximations of the response) as well as higher-order (supposedly better approximations) turn out to satisfy the conservation of flux relation, which means that the satisfaction of this relation is a necessary, but not…

Seismic hazard assessment in Menton, France: Topographical site effect zoning considering a semi-empirical approach and a Machine Learning scheme

The presence of topography influences the seismic ground motion and may result in strong amplifications, generally at the top of hills and reliefs. The increasing urbanization of hills requires an accurate estimation of these effects even in areas of moderate seismicity. The simplified coefficients provided by the Eurocodes8 do not depend on the frequency and underestimate the amplification in many situations, which justifies the development of new methods based on easily accessible data. The city of Menton, located in the southeast of France, between the Alps and the Ligurian basin, is one of…