Basic Geotechnical Earthquake Engineering by Dr. Kamalesh Kumar

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By Dr. Kamalesh Kumar

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Consequently, the most accurate measurements are obtained from the difference of arrival times at two or more receiving holes rather than from the time between the triggering and the arrival at single hole. P-waves travel faster than S-waves. Consequently, the sensors will already be excited by the P-waves when the S-waves arrive. This can make it difficult to pick out the arrival of the S-wave. To alleviate this difficulty it is desirable to use an energy source that is rich in the vertical shear component of motion and relatively poor in compressive motion.

10. Write short note about seismograph, seismogram and seismic waves obtained from seismogram. 1 INTRODUCTION Natural disasters like earthquake, landslide, flood, drought, cyclone, forest fire, volcanic eruption, epidemic and major accidents are quite common in different parts of the globe. These lead to the loss of life, property damage and socio-economic disruption. Such losses have grown over the years due to increase in population and physical resources. 8 million lives during the past two decades only and have adversely affected 820 million people with a financial loss of about 25-100 million dollars.

Earthquake events are reported from the Himalayan mountain range including Andaman and Nicobar Islands, Indo-Gangetic plain as well as from Peninsular region of India. Subduction/collision earthquakes in India occur in the Himalayan Frontal Arc (HFA). This arc is about 2500 km long and extends from Kashmir in the west to Assam in the east. It constitutes the central part of the Alpine seismic belt. This is one of the most seismically active regions in the world. The Indian plate came into existence after initial rifting of the southern Gondwanaland in late Triassic period.

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