چكيده فارسي :
The Himalayan region, north of Indian continent, is prone to high seismic activity as evidenced by high intensity earth quake Richter scale in the past 53 years. Most of the earthquakes in the Himalayan region with epicentre near to the Main Boundary Thrust (MBT) and Main Crystalline Thrust (MCT). In order to identify a reliable precursor, different methods and instrumentations are used to predict earthquakes. The reliable methods are statistical probability, physical measurements and geochemical observations, strain measurement and Randon emission, ground water levels’ fluctuations. The earthquake precursor study to establish relationship between the hydroseims (water table) and respective earthquake has been conducted by constructing four deep tube wells with of automatic water level recorder to continuous monitor the changes in the groundwater levels. The data stored in the digital water level recorder and is transmitted by telemetry system to the laboratory located at a distance of about 250 – 400kms. The data is recorded is also downloaded through a special device (Rugger) or to the laptop with a connector cord. The correlation of the groundwater levels with the seismic events shows that there is fluctuation before the arrival seismic waves. The broad conclusions are (i) there exist relationship between the intensity of the earthquake and the water level fluctuations (ii) the impact of the earthquakes on the water table is not uniform but is recorded differently in the tube wells installed at different locations (iii) the influence of the recharge to the water table by rainfall show different type of curves and relation is not always established between the impact of the earthquake and rainfall recharge (iv) more tube wells to monitor the water levels should be installed in the aquifer system which are laterally extensive. It is opined that with the future research work on the subject, it would be possible to predict earthquake using hydroseims. The earlier works show that the earthquake event can be predicted varying from one hour to more than one day. The paper discusses the geological setup, design and construction of tube well and the relationship between the earthquake events, vis-à-vis the water table curves.
