Question

I11.8. As you know, data from satellites are used to locate a GPS receiver, and data from seismic stations are used to locate an earthquake. Explain the physical/mathematical principle which both methods have in common. (No need to explain the different technical details; just concentrate on the underlying fundamentals. But do point out what the respective input data are.)

Answer 1

Working principle of satellite to locate earth equate A particular imaging technique called INSAR takes many radar images of same landscape at short intervals these images are analysed over a very broad region. To find deformation this way satellite can detest slight deformation of earth crust which may be initial strain before earthquake Many such satellites are synchronized in such way that combined data from that can detect very minute deformations. Input is image (infrared) why infrared because they can penetrate gaseous atmospheres quite easily, \r\n working of seismic stations seismic stations also detect vibrate of earth in different way A container is rigidly attached to earth and a very sensitivity spring is attached to container that have a small balanced rigidly attached earth mass when earth vibrates psedo force on balanced mass and set it in vibration by measure motion of mass, motion of earth vibration can be detected. Now this is over simplified picture, instead of spring, electronic circuits are used.