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What is the place on the surface where the earthquake is first felt called?
When an earthquake occurs, the body waves travel through the interior, but it is at the surface where they are "felt" as a disaster. The epicenter is the primary contact point between the internal energy release and human civilization. It is here that the P-waves arrive first, followed by S-waves anRead more
When an earthquake occurs, the body waves travel through the interior, but it is at the surface where they are “felt” as a disaster. The epicenter is the primary contact point between the internal energy release and human civilization. It is here that the P-waves arrive first, followed by S-waves and finally the destructive Surface waves. The epicenter serves as the starting point for mapping “isoseismal lines” (lines of equal intensity). Even though the focus is the real origin, the epicenter is the geographic marker used for emergency response and for identifying the proximity of the quake to populated cities.
See lessThe elastic rebound theory explains the origin of which of the following?
Proposed by H.F. Reid, this theory is the fundamental explanation for how tectonic earthquakes occur. Imagine stretching a rubber band until it snaps; the energy released and the "snap back" represent the earthquake and the crustal adjustment. In the Earth, tectonic forces apply stress to brittle crRead more
Proposed by H.F. Reid, this theory is the fundamental explanation for how tectonic earthquakes occur. Imagine stretching a rubber band until it snaps; the energy released and the “snap back” represent the earthquake and the crustal adjustment. In the Earth, tectonic forces apply stress to brittle crustal rocks. Instead of breaking immediately, these rocks bend and store “elastic strain energy.” Eventually, the stress overcomes the friction holding the rocks together at a fault. The rocks fracture at the focus, releasing the energy that we feel as tremors and the displaced blocks settle into a new equilibrium.
See lessWho propounded the elastic rebound theory related to the origin of earthquakes?
Harry Fielding Reid, an American geophysicist, revolutionized seismology by moving beyond simple observation to mechanical explanation. By examining the displacement of fences and roads along the San Andreas Fault, he concluded that earthquakes are not caused by the movement of the fault itself, butRead more
Harry Fielding Reid, an American geophysicist, revolutionized seismology by moving beyond simple observation to mechanical explanation. By examining the displacement of fences and roads along the San Andreas Fault, he concluded that earthquakes are not caused by the movement of the fault itself, but by the release of accumulated elastic strain. His theory displaced older ideas that earthquakes were purely volcanic or chemical. Today, “Elastic Rebound” remains the core principle taught in structural geology, explaining the cycle of stress accumulation and release that defines the behavior of active fault lines across the globe.
See lessWhere did Chittaranjan Das and Motilal Nehru establish the Swaraj Party in 1923? (A) Patna (B) Lucknow (C) Allahabad (D) None of these
After Gandhi suspended the Non-Cooperation Movement in 1922, a section of the Congress known as "Pro-Changers" felt that the movement should move into the legislative halls. C.R. Das (as President) and Motilal Nehru (as Secretary) launched the Swaraj Party at Anand Bhawan, Allahabad. Their strategyRead more
After Gandhi suspended the Non-Cooperation Movement in 1922, a section of the Congress known as “Pro-Changers” felt that the movement should move into the legislative halls. C.R. Das (as President) and Motilal Nehru (as Secretary) launched the Swaraj Party at Anand Bhawan, Allahabad. Their strategy was to enter the councils to “wreck the constitution from within.” This created a temporary split in the Congress between the Swarajists and the “No-Changers” (like Sardar Patel), but eventually, they worked together, with the Swarajists acting as the political wing of the nationalist movement in the mid-1920s.
See lessBy which law did the British government first declare its intention to gradually establish a responsible government in India?
Made in the British House of Commons, this declaration was a strategic move to secure Indian support during World War I and to pacify the Home Rule agitators. It acknowledged that India had moved beyond mere administrative reforms. This promise led directly to the Government of India Act 1919 (MontaRead more
Made in the British House of Commons, this declaration was a strategic move to secure Indian support during World War I and to pacify the Home Rule agitators. It acknowledged that India had moved beyond mere administrative reforms. This promise led directly to the Government of India Act 1919 (Montagu-Chelmsford Reforms). While nationalists criticized it as “too little, too late” and devoid of a fixed timeline, it was a major constitutional shift because it formally replaced the “benevolent despotism” of the British Raj with the principle of accountability to an Indian electorate.
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