Site characterization using surface wave methods in the Arsin-Trabzon province, NE Turkey

Akın, Özgenç; Sayıl, Nilgün

doi:10.1007/s12665-015-4840-6

Cited by 26 publications

(4 citation statements)

References 24 publications

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“…Analyzing the seismic background noise during different time intervals, this method allows to obtain the soil fundamental frequency (f0), related to the strong impedance contrast at the soil-bedrock interface (Field and Jacob 1993). This fundamental frequency can then be used to estimate the depth of the soil-bedrock interface by means of empirical relations with borehole stratigraphies or velocity-depth profiles in places where this kind of results are available (Ibs-Von Seht and Wohlenberg 1999; Delgado et al 2000;Benjumea et al 2011;Akin and Sayil 2016). HVSR methods were applied by Gabàs et al (2016) to define the geometry of the CB along a 2D-profile.…”

Section: Horizontal To Vertical Spectral Ratio (Hvsr)mentioning

confidence: 99%

Mapping the basement of the Cerdanya Basin (Eastern Pyrenees) using seismic ambient noise

Díaz

Ventosa

Schimmel

et al. 2022

Preprint

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Abstract. Ambient seismic noise acquired in the Cerdanya Basin (Eastern Pyrenees) is used to assess the capability of different methodologies to map the geometry of a small-scale sedimentary basin. We present results based on a 1-year long broad-band deployment covering a large part of the Eastern Pyrenees and a 2-months long high-density deployment covering the basin with interstation distances around 1.5 km. The explored techniques include autocorrelations, horizontal to vertical spectra ratio, ambient noise Rayleigh wave tomography and band-pass filtered ambient noise amplitude mapping. The basement depth estimations retrieved from each of these approaches, based on independent datasets and different implicit assumptions, are consistent, showing that the deeper part of the basin is located in its central part, reaching depths of 600–700 m close to the Têt Fault trace bounding the Cerdanya Basin to the NE. The consistency between the results from all the methodologies provides solid constraints to our basement depth estimation. The results show also that when high-density seismic data are available, mapping the ambient noise amplitude in a selected frequency band is a valid tool to quickly map the sedimentary 3D geometry. Beside this methodological aspect, our results help to improve the geological characterisation of the Cerdanya Basin and will provide further constraints to refine the seismic risk maps of an area of relevant touristic and economic activity.

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Section: Horizontal To Vertical Spectral Ratio (Hvsr)mentioning

confidence: 99%

Mapping the basement of the Cerdanya Basin (Eastern Pyrenees) using seismic ambient noise

Díaz

Ventosa

Schimmel

et al. 2022

Preprint

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“…In addition, HVSR value is also used to determine the thickness of the soil layers on the bedrock by means of experimental relationships (Field and Jacop 1993;Birgören et al 1998;Özalaybey et al 2011). After Nakamura (1989), the method has been widely used by many researchers in engineering applications to analyses local soil conditions (Gallipoli and Mucciarelli 2009;Akkaya 2015;Akın and Sayıl 2016;Pamuk et al 2017a-b;Öztürk et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Subsurface characterization by active and passive source geophysical methods after the 06 February 2023 earthquakes in Turkey

Karslı,

Babacan,

Akın

2024

Nat Hazards

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Two large earthquakes (Mw = 7.7 and Mw = 7.6) that occurred in Turkey on February 6, 2023, affected a very extent region and caused a lot of loss of life and property. This paper presents preliminary results from geophysical measurements (Seismic Refraction Tomography-SRT, Multi-Channel Surface Wave Analysis-MASW and Microtremor-MT) on eight profiles in four provinces (Kahramanmaraş, Hatay, Malatya, Gaziantep) to understand the relationship between subsurface properties and the destruction that occurs immediately after earthquakes. By analyzing the geophysical data, the dynamic-elastic properties of ground and the soil classification according to Vs30 were determined. It is generally understood that the near-surface (< ~ 10–15 m) units in the measurement areas are very loose, and the deeper ones (≥ ~ 15–20 m) have a very porous/fractured structure. Soil classes were defined as ZD (Malatya-1, Hatay-1 and Kahramanmaraş-1) and ZC (Malatya-2, Hatay-2, Gaziantep-1,2 and Kahramanmaraş-2). In addition, by evaluating the information of strong ground motion station closest to the measurement profiles, it is observed that the PGA values versus epicenter distances are higher at stations in the zone parallel to the direction of both faults than those in the perpendicular zones. This leads directivity effect in the propagation of earthquake waves. The results indicate that one of the basic reasons for the damages is that the earthquake-ground-structure relationship has not been fully and accurately reflected in building designs. Therefore, future researches involving more geophysical data and PGA values will provide more information about the structural, physical and geotechnical properties of subsurface and definitive results.

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“…Rayleigh waves will propagate most effectively in which frequency range is defined as the dominant frequency (fo) [8]. This technique, have been extensively studied by many researchers to measure the site effects such as amplification, ambient noise produced by soft ground layers in certain frequency bands [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Soil behavior analysis depends not only on the geomorphology and properties of the subterranean soil layers, but also on the bedrock type and location.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Site Characterization and Vulnerability in Antakya (Turkey) under Basin Effect

BÜYÜKSARAÇ,

BEKTAŞ,

IŞIK

et al. 2023

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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It is very important and necessary to know the depth of the bedrock in determining the soil behavior. However, determining the depth of bedrock spatially is a very difficult and costly process. The depth of the bedrock can be obtained by using the dominant vibration frequency obtained by the microtremor data. The bedrock depth map was created with the correlation produced from the dominant vibration frequencies obtained from microtremor measurements made in Antakya (Turkey). In bedrock calculations at low frequencies, the value range shows scattering. In the vulnerability analysis for Antakya soils, a low level of vulnerability (Kg = 6) was obtained in the east and northeast of the area. It has been observed that the S-wave velocity (Vs) in this area is lower than 406 ms-1. In this case, this value has been accepted as the vulnerability threshold value in Antakya soils. Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) were obtained for each location by using earthquake ground motion levels with 2%, 10%, 50%, and 68% probability of exceedance in 50-year periods. The PGA values in the region range from 0.43 to 0.47 g for earthquakes with a return period of 475 years.

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Site characterization using surface wave methods in the Arsin-Trabzon province, NE Turkey

Cited by 26 publications

References 24 publications

Mapping the basement of the Cerdanya Basin (Eastern Pyrenees) using seismic ambient noise

Mapping the basement of the Cerdanya Basin (Eastern Pyrenees) using seismic ambient noise

Subsurface characterization by active and passive source geophysical methods after the 06 February 2023 earthquakes in Turkey

Investigation of Site Characterization and Vulnerability in Antakya (Turkey) under Basin Effect

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