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Shear wave velocity model using HVSR inversion beneath Bandar Lampung City

Earthquake Science 2024年第4期37卷 337-351页

作者： Ahmad Zaenudin Alhada Farduwin gede i boy darmawan Karyanto Department of Geophysical Engineering University of LampungBandar Lampung 35145Indonesia Department of Geophysical Engineering Sumatera Institute of TechnologySouth Lampung 35365Indonesia

The horizontal-to-vertical spectral ratio(HVSR)method has been used to characterize site-effect parameters that are indispensable in seismic hazard and risk-reduction studies in urban areas and rapid land-use *** method is widely used because it is the cheapest and simplest geophysical method for the acquisition and processing *** subsequent developments,the HVSR method has been widely used to determine elastic rock parameters,particularly shear wave velocity(v_(S)),through the HVSR curve inversion ***,the v_(S)structural model can be used to delineate the presence of complex geological structures,particularly faults and sedimentary *** Lampung is a city in Lampung Province with many fault structures and groundwater basins to the *** are 83 HVSR measurement points around Bandar Lampung for delineating the presence of fault structures and groundwater *** produced the HVSR curve from the measurement results and then performed an inversion process using the particle swarm optimization algorithm to obtain v_(S)for the depth ***,from this profile,we produced a two-dimensional(2D)lateral and vertical *** mean v_(S)value was calculated from all the measurement points,and we found stiff soil layers reaching depths of approximately 5 m,with a value of v_(S)ith a velocity exceeding 1250 m/s was visible at a depth of 100 *** on the 2D model,the v_(S)structure shows that the city of Bandar Lampung is divided into two zones,with a NW-SE *** north-middle-eastern part of the city consists of harder *** harder rock is characterized by extremely high v_(S)values,starting from a depth of 50 *** contrast,the south-middle-west exhibits a low-moderate v_(S)anomaly associated with groundwater basins SW of the *** the 2D v_(S)structural model,fault structures can be found along the city,characterized by a contrast of v_(S)values from low to medium and from me

关键词： shear wave velocity HVSR fault structures groundwater basin Bandar Lampung City

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Groundwater exploration using integrated geophysics method in hard rock terrains in Mount Betung Western Bandar Lampung,indonesia

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Journal of Groundwater Science and Engineering 2022年第1期10卷 10-18页

作者： Rustadi i gede boy darmawan Nandi Haerudin Agus Setiawan Suharno Department of Geophysical Engineering University of LampungBandar LampungIndonesia Department of Environment Science University of LampungBandar Lampung

The presence of hard rock in Mount Betung has caused the misalignment of the groundwater aquifers,and resulted in many drilling failures for *** integrated geophysics method using gravity survey and Geoelectric Vertical Electrical Soundings(VES)were conducted to study the effect of basement and hard rock on groundwater *** the gravity method,38 mapping points were carried out randomly,with a distance of 1-2 km ***,from the geoelectric method,51 VES points were acquired at the foot of Mount *** acquisition was conducted with a Schlumberger configuration with AB/2=1 m to 250 *** results show the Bouguer Anomaly in the west is 50-68 mgal due to the presence of hard rock in Mount *** anomaly responds to relatively shallow hard rocks near *** rocks composed of andesite and breccia normally present at the depth of 5-180 m during well *** isopach mapping from VES data(at AB/2=50 m,100 m,and 150 m)shows the dominant constituents of hard *** in hard rock contribute to secondary porosity,which could be a prospect zone that transmit *** finding shows that the fractures are randomly scattered,causing several well failures that have been ***,the fractures in the hard rock at the foot of Mount Betung acts as conduits between recharge at Mount Betung and the aquifer in the Bandar Lampung Basin.

关键词： Geoelectric Gravity Groundwater Hard Rocks VES

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