chabib muwaffaq - Academia.edu (original) (raw)

Uploads

Papers by chabib muwaffaq

Research paper thumbnail of Lasem Fault Modeling in Pati Rembang Area Using Gravity Method Based on Topex Satellite Data

INTERNATIONAL JOURNAL OF RECENT TRENDS IN ENGINEERING & RESEARCH, Oct 30, 2019

Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault ... more Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault indication. The Lasem fault is indicated in 3 zones, namely the Rembang zone, Randublatung depression zone and Semarang-Rembang depression zone. Lasem fault is a fault located in the Pati-Rembang area which is an active fault and is close to the Semarang area. This research uses the gravity method as a basic understanding. The data uses obtained through the TOPEX/POSEIDON website. The data obtained were 154 measurement points at coordinates 111000' BT (E)-111013' BT (E) and 6040' LS (S)-6050' LS (S). The results obtained on TOPEX/POSEIDON are data of latitude and longitude coordinates, elevation and free air anomaly correction values. After that, further correction is made in the form of bouguer correction and terrain correction so that the complete bouguer anomaly value is obtained. The complete bouguer anomaly data is analyzed by spectrum with the results of depth estimation for the anomaly. Then an upward continuation is carried out to separate regional anomalies and residual anomalies. After that the gradient analysis filter, eulerdeconvolution, 3D and 2D modeling are done. Gradient analysis filter in the form of first horizontal gradient with the results in the form of fault indications and second vertical derivatives to determine the type of fault that is strike-slip fault. Euler deconvolution is used to determine the estimated subsurface depth with yields of up to 5000 m below sea level. 3D modeling is carried out to see fault indications which result that faults can be seen from depths of 1200 m to 4000 m. 2D modeling results show the types of rocks in the form of claystone, sandstone, limestone, and andesite, respectively the rocks have a density of 2.21 gr/cm 3 , 2.35 gr/cm 3 , 2.55 gr/cm 3 and 2.6 gr/cm 3. Keywords-Lasem fault, gravity method, gradient analysis, euler analysis, 3D and 2D modeling.. I. INTRODUCTION The gravity method is one of the geophysical methods based on the measurement of small variations in a gravity field. The difference in small variations or deviations in the terrain from point to point above the surface of the earth, is caused by lateral variations [1][2]. The gravity method is a method that studies variations in the gravity field that occur by variations in the density of rock masses below the surface, so that the variation investigated is the difference in the gravity field from an observation point to another point [2][3]. The gravity method can be used in analyzing the presence of the lasem fault by looking for the density variable that is below the surface. Lasem Fault is a fault with the longest straightness, occupying a depression with axes trending southwest-northeast. In previous research which concluded that by doing inversion modeling from gravity data concluded that the Lasem fault lies in 3 zones, namely the Rembang zone, the Randublatung depression zone and the Semarang-Rembang depression zone. Then the inversion modeling results obtained are depression models in the south and north of the study area with a density in the range of values 2,1-2,8 gr/cm3 [4].

Research paper thumbnail of LASEM FAULT MODELING IN PATI-REMBANG AREA USING GRAVITY METHOD BASED ON TOPEX SATELLITE DATA

Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault ... more Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault indication. The Lasem fault is indicated in 3 zones, namely the Rembang zone, Randublatung depression zone and Semarang-Rembang depression zone. Lasem fault is a fault located in the Pati-Rembang area which is an active fault and is close to the Semarang area. This research uses the gravity method as a basic understanding. The data uses obtained through the TOPEX/POSEIDON website. The data obtained were 154 measurement points at coordinates 111000' BT (E)-111013' BT (E) and 6040' LS (S)-6050' LS (S). The results obtained on TOPEX/POSEIDON are data of latitude and longitude coordinates, elevation and free air anomaly correction values. After that, further correction is made in the form of bouguer correction and terrain correction so that the complete bouguer anomaly value is obtained. The complete bouguer anomaly data is analyzed by spectrum with the results of depth estimation for the anomaly. Then an upward continuation is carried out to separate regional anomalies and residual anomalies. After that the gradient analysis filter, eulerdeconvolution, 3D and 2D modeling are done. Gradient analysis filter in the form of first horizontal gradient with the results in the form of fault indications and second vertical derivatives to determine the type of fault that is strike-slip fault. Euler deconvolution is used to determine the estimated subsurface depth with yields of up to 5000 m below sea level. 3D modeling is carried out to see fault indications which result that faults can be seen from depths of 1200 m to 4000 m. 2D modeling results show the types of rocks in the form of claystone, sandstone, limestone, and andesite, respectively the rocks have a density of 2.21 gr/cm 3 , 2.35 gr/cm 3 , 2.55 gr/cm 3 and 2.6 gr/cm 3 .

Research paper thumbnail of Lasem Fault Modeling in Pati Rembang Area Using Gravity Method Based on Topex Satellite Data

INTERNATIONAL JOURNAL OF RECENT TRENDS IN ENGINEERING & RESEARCH, Oct 30, 2019

Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault ... more Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault indication. The Lasem fault is indicated in 3 zones, namely the Rembang zone, Randublatung depression zone and Semarang-Rembang depression zone. Lasem fault is a fault located in the Pati-Rembang area which is an active fault and is close to the Semarang area. This research uses the gravity method as a basic understanding. The data uses obtained through the TOPEX/POSEIDON website. The data obtained were 154 measurement points at coordinates 111000' BT (E)-111013' BT (E) and 6040' LS (S)-6050' LS (S). The results obtained on TOPEX/POSEIDON are data of latitude and longitude coordinates, elevation and free air anomaly correction values. After that, further correction is made in the form of bouguer correction and terrain correction so that the complete bouguer anomaly value is obtained. The complete bouguer anomaly data is analyzed by spectrum with the results of depth estimation for the anomaly. Then an upward continuation is carried out to separate regional anomalies and residual anomalies. After that the gradient analysis filter, eulerdeconvolution, 3D and 2D modeling are done. Gradient analysis filter in the form of first horizontal gradient with the results in the form of fault indications and second vertical derivatives to determine the type of fault that is strike-slip fault. Euler deconvolution is used to determine the estimated subsurface depth with yields of up to 5000 m below sea level. 3D modeling is carried out to see fault indications which result that faults can be seen from depths of 1200 m to 4000 m. 2D modeling results show the types of rocks in the form of claystone, sandstone, limestone, and andesite, respectively the rocks have a density of 2.21 gr/cm 3 , 2.35 gr/cm 3 , 2.55 gr/cm 3 and 2.6 gr/cm 3. Keywords-Lasem fault, gravity method, gradient analysis, euler analysis, 3D and 2D modeling.. I. INTRODUCTION The gravity method is one of the geophysical methods based on the measurement of small variations in a gravity field. The difference in small variations or deviations in the terrain from point to point above the surface of the earth, is caused by lateral variations [1][2]. The gravity method is a method that studies variations in the gravity field that occur by variations in the density of rock masses below the surface, so that the variation investigated is the difference in the gravity field from an observation point to another point [2][3]. The gravity method can be used in analyzing the presence of the lasem fault by looking for the density variable that is below the surface. Lasem Fault is a fault with the longest straightness, occupying a depression with axes trending southwest-northeast. In previous research which concluded that by doing inversion modeling from gravity data concluded that the Lasem fault lies in 3 zones, namely the Rembang zone, the Randublatung depression zone and the Semarang-Rembang depression zone. Then the inversion modeling results obtained are depression models in the south and north of the study area with a density in the range of values 2,1-2,8 gr/cm3 [4].

Research paper thumbnail of LASEM FAULT MODELING IN PATI-REMBANG AREA USING GRAVITY METHOD BASED ON TOPEX SATELLITE DATA

Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault ... more Research on Lasem fault modeling has been carried out to analyze the location of the Lasem fault indication. The Lasem fault is indicated in 3 zones, namely the Rembang zone, Randublatung depression zone and Semarang-Rembang depression zone. Lasem fault is a fault located in the Pati-Rembang area which is an active fault and is close to the Semarang area. This research uses the gravity method as a basic understanding. The data uses obtained through the TOPEX/POSEIDON website. The data obtained were 154 measurement points at coordinates 111000' BT (E)-111013' BT (E) and 6040' LS (S)-6050' LS (S). The results obtained on TOPEX/POSEIDON are data of latitude and longitude coordinates, elevation and free air anomaly correction values. After that, further correction is made in the form of bouguer correction and terrain correction so that the complete bouguer anomaly value is obtained. The complete bouguer anomaly data is analyzed by spectrum with the results of depth estimation for the anomaly. Then an upward continuation is carried out to separate regional anomalies and residual anomalies. After that the gradient analysis filter, eulerdeconvolution, 3D and 2D modeling are done. Gradient analysis filter in the form of first horizontal gradient with the results in the form of fault indications and second vertical derivatives to determine the type of fault that is strike-slip fault. Euler deconvolution is used to determine the estimated subsurface depth with yields of up to 5000 m below sea level. 3D modeling is carried out to see fault indications which result that faults can be seen from depths of 1200 m to 4000 m. 2D modeling results show the types of rocks in the form of claystone, sandstone, limestone, and andesite, respectively the rocks have a density of 2.21 gr/cm 3 , 2.35 gr/cm 3 , 2.55 gr/cm 3 and 2.6 gr/cm 3 .