Application of Double-Difference Method to Micro-seismic Data in a Geothermal Exploration Field

Nugraha, Andri Dian; Widiyantoro, Sri; Syahputra, Ahmad; Sule, Rachmat

doi:10.1190/segj112013-107

Cited by 1 publication

(2 citation statements)

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“…The distribution pattern of Vp and Vs values is relatively identical, the value is increasing as depth, there are striking differences values on the southern and northern parts. The distribution of Vp/Vs values that pass through hot springs is 1.8, Vp/Vs values illustrate the elasticity properties of rocks [12] and correlated with pore fluid pressure [13]. according to the result of [13] that the combination of high Vp, low Vs, and high Vp/Vs can be interpreted as rock fluid-saturated, in this study the combination is shown below HS-02, it reflects the potential area.…”

Section: Results and Analysissupporting

confidence: 52%

“…The distribution of Vp/Vs values that pass through hot springs is 1.8, Vp/Vs values illustrate the elasticity properties of rocks [12] and correlated with pore fluid pressure [13]. according to the result of [13] that the combination of high Vp, low Vs, and high Vp/Vs can be interpreted as rock fluid-saturated, in this study the combination is shown below HS-02, it reflects the potential area. Subsurface lithology is determined based on the interpretation of the distribution of wave velocity values then compared to outcrops in the field.…”

Section: Results and Analysissupporting

confidence: 52%

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Delineation of Geothermal Manifestation in Sangubanyu Area Based on Microtremor HVSR Method

2019

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The aims of this study is to describe the distribution of P wave velocity and S wave velocity value and Vp/Vs ratio based on microtremor HVSR method and its relationship with the appearance of hot spring at Sangubanyu Village. Geothermal manifestations in the Sangubanyu area are located in Bawang sub-district, Batang regency, and Plantungan sub-district, Kendal regency, Central Java province. HVSR method is used to process microtremor data which produces the dominant frequency value and amplification factor then do inversion on the H/V curve to get the value of the Vp and Vs. The results of the microtremor HVSR processing obtained the distribution of the dominant frequency values in the study area between 0.62 to 0.73 Hz and amplification factor values 1.09 to 1.39, the inversion results on the H/V curve obtained the distribution of Vp values between 131.76 m/s to 2181.19 m/s, Vs values between 76.61 to 1129.42 m/s, Vp/Vs ratio 1.64 – 3.35. Based on the results of the analysis and wave velocity interpretation, the subsurface structure of manifestation area of Sangubanyu is composed of tuffaceous sandstone and volcanic breccia, the normal faults with southern blocks relatively downthrown, that cause the appearance of hot springs.

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Section: Results and Analysissupporting

confidence: 52%