Now, earthquake measures start from the ground! We can calculate how much the investigation site will shake.
The damage caused by earthquakes varies depending on the magnitude of the earthquake and the hardness of the ground. During the Great East Japan Earthquake in 2011, even areas far from the epicenter experienced damage to buildings, including structural damage and collapses. One of the factors contributing to this is believed to be the hardness of the ground. The magnitude of an earthquake is influenced by the ground strength and layer thickness as the earthquake occurs in an engineering foundation (where seismic waves travel at over 400 m/s) and propagates through the ground. In other words, if the ground is soft and the layer thickness is large, the ground shaking will be more intense. The investigation of ground shaking susceptibility calculates the necessary coefficient Co to determine seismic forces based on the results of ground surveys conducted through "surface wave exploration." It is possible to estimate seismic forces taking into account the ground conditions of the survey site.
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【Details of Ground Shakeability Survey】 In the ground shakeability survey using the "Surface Wave Exploration Method," the velocity structure of the ground and the thickness of the strata up to the engineering foundation are examined. This allows us to understand how the ground will shake during an earthquake and calculate the extent to which the second-floor slab of a new building will displace (or how much damage it may incur). *For more details, please refer to the PDF document or feel free to contact us.*
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【Usage】 ■ During new construction, etc. *For more details, please refer to the PDF document or feel free to contact us.
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Before ground reinforcement work, accurate ground surveys for cost reduction. The surface wave exploration method investigates the hardness and softness of the ground with high precision based on the speed of vibrations traveling through the ground.