Mapping Subsurface Structures and Parameters in a Hydropower Dam

This article provides a summary of the seismic method in geophysics, which plays a vital role in determining the rock structure in the subsurface of the Earth. The seismic method utilizes the propagation of seismic waves through solid materials to gather information about subsurface characteristics. This summary explores the different types of seismic waves, advantages of the method, and its applications in various industries.

Principles of the Seismic Method

  • Seismic waves generated by natural or artificial sources propagate through the subsurface.
  • Seismometers measure ground motion, capturing the response between the source signal and subsurface physical parameters.
  • Seismograms depict amplitudes of ground motion, representing the arrival and strength of the seismic energy.
  • Various types of seismic waves are recorded, including body waves (P, S, converted, and reflected waves) and surface waves (Rayleigh and Love waves).

Advantages of the Seismic Method

  • Remote mapping of subsurface structures and parameters, such as oil, gas, water, and mineral deposits.
  • Ability to detect both large-scale objects (e.g., lithospheric structures) and small-scale objects (e.g., cracks inside rocks).
  • Significance in understanding the Earth’s structure, contributing to the development of plate tectonics.
  • Versatile application in sustainable energy engineering, such as in hydropower dam development.

Seismic Refraction Tomography

  • A branch of the seismic method focused on first arrival travel time seismic tomography.
  • Based on the fastest arrivals of waves recorded in seismograms to detect subsurface cross-structure.
  • Utilized in creating lithospheric maps worldwide, providing valuable insights into subsurface characteristics.

Challenges and Requirements for Small-Scale Object Determination

  • Determining small-scale objects with dimensions in the order of several meters demands specific conditions.
  • High-frequency sources (thousands of Hertz) are necessary, posing technical challenges.
  • Seismic measurements should cover the subsurface with multiple seismic rays.
  • Noise levels should be minimized to accurately extract first arrival travel times from the seismograph.

PT Adi Candra Teknologi Experiences in Feasibility Study

At Adi Candra Teknologi, we done Feasibility Study, including Mapping Subsurface Structures and Parameters in a Hydropower Dam for government entity, private investor, national consulting engineering company, and also international engineering consultant company. For more details about the work we have done, please visit the our Portofolio Page.

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