Land seismic refraction tomography using homogeneous velocity as initial model

Nurhandoko, Bagus Endar B.; Matsuoka, Toshifumi; Watanabe, Toshiki; Ashida, Yuzuru

doi:10.1190/1.1820799

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…We employed the Fresnel wavepath tomography method, which combines ray path and phase components based on the Rytov approximation (Nurhandoko, 2000(Nurhandoko, , 2016Nurhandoko et al, 1999Nurhandoko et al, , 2016Nurhandoko & Ashida, 1998;Vasco et al, 1995). The Fresnel wavepath is thin at higher frequencies and wider at lower frequencies.…”

Section: St Surveymentioning

confidence: 99%

RETRACTED: Geo‐archaeological prospecting of Gunung Padang buried prehistoric pyramid in West Java, Indonesia

Natawidjaja,

Bachtiar,

Nurhandoko

et al. 2023

Archaeological Prospection

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The multidisciplinary study of Gunung Padang has revealed compelling evidence of a complex and sophisticated megalithic site. Correlations between rock stratifications observed through surface exposures, trenching and core logs, combined with GPR facies, ERT layers, and seismic tomograms, demonstrate the presence of multi‐layer constructions spanning approximately 20–30 m. Notably, a high‐resistive anomaly in electric resistivity tomography aligns with a low‐velocity anomaly detected in seismic tomography, indicating the existence of hidden cavities or chambers within the site. Additionally, drilling operations revealed significant water loss, further supporting the presence of underground spaces. Radiocarbon dating of organic soils from the structures uncovered multiple construction stages dating back thousands of years BCE, with the initial phase dating to the Palaeolithic era. These findings offer valuable insights into the construction history of Gunung Padang, shedding light on the engineering capabilities of ancient civilizations during the Palaeolithic era.

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Section: St Surveymentioning

confidence: 99%

RETRACTED: Geo‐archaeological prospecting of Gunung Padang buried prehistoric pyramid in West Java, Indonesia

Natawidjaja,

Bachtiar,

Nurhandoko

et al. 2023

Archaeological Prospection

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“…Since the local direction of the ray at X'k is defined by the line connecting the two endpoints of the path segment, Xk-1 and Xk+1, the normal component of the velocity gradient with respect to this direction indicates the direction of curvature. This direction corresponds to the factual location of X'k that conforms to equation (2). The formulation of this direction is provided by…”

Section: Ray Tracing Employing the Pseudo-bending Methodsmentioning

confidence: 99%

“…This method has developed for shallow subsurface investigation and more effective for site characterization compared to conventional seismic refraction [1]. Imaging of subsurface can be conducted using seismic refraction method based on "width-band Fresnel" tomography simulation and utilized homogeneous velocity as an input model [2]. Application of seismic refraction exploration for engineering and environmental geophysical can be implemented by employing the travel time tomography [3].…”

Section: Introductionmentioning

confidence: 99%

Computation and Modelling of Seismic Refraction Tomography for Anisotropic Medium Based on Pseudo Bending Method

Hamimu,

Haraty,

Rubaiyn

et al. 2024

J. Phys.: Conf. Ser.

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Seismic refraction tomography is one of the imaging techniques in geophysical methods used to remodel the near-surface velocity layer structure of the Earth. In this study, we carried out a new computational approach and modelling of seismic refraction tomography using the pseudo-bending method. The true model of the near-surface is designed to be anisotropic medium which is having a low velocity anomaly distribution. This anomaly is constructed in such a way as to be similar to a model of liquid waste away spreading, which exhibits seismic velocities ranging from 1600 m/s to 1800 m/s. Based on our computations and numerical modelling results, it was found that the ray tracing path using pseudo-bending method displays an asymmetrical trajectory when the positions of the source and geophone are exchanged. Altering the shooting configuration from direct shoot (DS) to reversed shoot (RS) also reveals a significant difference in travel time values. The results of delay time tomography inversion, which represents the difference between travel times in the true model and the initial model using the SIRT method, indicate the presence of a low velocity anomaly that can be interpreted as the distribution of liquid waste.

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“…Therefore, it is able to resolve velocity gradients and lateral velocity changes and can be applied in geological conditions where conventional refraction techniques fail, such as areas of compaction, karst, and fault zones (Hiltunen and Cramer, 2008;Metwally et al, 2017;Brixová et al, 2018;Akingboye and Ogunyele, 2019;Herlambang and Riyanto, 2021). Several studies (White, 1989;Nurhandoko et al, 1999;Leucci et al, 2007;Azwin et al, 2013;Bery, 2013) prove the high applicability of the SRT technique in subsurface velocity modelling and ground exploration. They showed that seismic refraction tomography performed well in many situations where traditional refraction techniques failed to identify vertical and horizontal velocity gradients.…”

Section: Introductionmentioning

confidence: 99%

Role of Seismic Refraction Tomography (SRT) in bedrock mapping; case study from industrial zone, Ain-Sokhna area, Egypt

EL HAMEEDY,

MABROUK,

DAHROUG

et al. 2023

Contrib. Geophys. Geod.

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In this study, eighteen compressional P-wave seismic refraction profiles survey was conducted on the western side of the Gulf of Suez, Egypt, to map bedrock topography, which is vital information in foundation pole placement and design for large factory construction. The configuration of the seismic survey consists of 10 metres geophone intervals (12 and 24 channels) with a total survey length of 3150 metres survey length. The seismic compressional wave velocity distribution reveals three layers ranging from (400 to 1100 m/s), (1200 to 2000 m/s), and (2200 to 3500 m/s). According to the data, the first low-velocity layer represents unconsolidated Wadi sediments. The second layer, on the other hand, comprises consolidated Wadi sediments, while the third layer comprises fractured to intact sandstone bedrock. The thickness of the first layer is believed to be between 0.5 and 10 m, while the thickness of the second layer is between 8.5 and 25 m. Pseudo-3D model of velocity distribution was constructed, revealing the presence of several low-velocity zones at a depth ranging from 15 to 32 m. Then, the topography of the non-rippable sandstone rock mass was mapped utilizing 3-D model. Finally, the correlation between seismic refraction tomography (SRT) results and nearby well logging dataset drilled by the Egyptian Geological Survey and Mining Authority (EGSMA) matched quite well. It may be inferred that, up to a depth of 15 to 32 metres, there is a high-velocity rock layer suitable for constructing deep foundations for multiple levels of the mega factory.

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Land seismic refraction tomography using homogeneous velocity as initial model

Cited by 4 publications

References 2 publications

RETRACTED: Geo‐archaeological prospecting of Gunung Padang buried prehistoric pyramid in West Java, Indonesia

RETRACTED: Geo‐archaeological prospecting of Gunung Padang buried prehistoric pyramid in West Java, Indonesia

Computation and Modelling of Seismic Refraction Tomography for Anisotropic Medium Based on Pseudo Bending Method

Role of Seismic Refraction Tomography (SRT) in bedrock mapping; case study from industrial zone, Ain-Sokhna area, Egypt

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