The 1934 Bihar earthquake, also known as the Bihar-Nepal earthquake, was a magnitude 8.4 earthquake that struck the Bihar province of British India and Nepal on January 15, 1934. It is considered to be the most devastating earthquake in India's history, causing an estimated 30,000 to 100,000 deaths.

The 2001 Bhuj earthquake, also known as the Gujarat earthquake, was a magnitude 7.7 earthquake that struck the state of Gujarat in India on January 26, 2001. It caused widespread damage and loss of life, with an estimated 20,000 to 30,000 deaths.

The Indo-Australian Plate is responsible for most of the earthquakes in India. It is a tectonic plate that includes the Indian subcontinent and the Australian continent. The collision of the Indo-Australian Plate with the Eurasian Plate has created the Himalayas and is responsible for the seismic activity in the region.

Surface waves are the type of earthquake waves that cause the most damage to buildings and infrastructure. They are slower than P-waves and S-waves, but they have a larger amplitude and can cause the ground to shake violently.

The Richter scale is used to measure the magnitude of an earthquake. It is a logarithmic scale that expresses the energy released by an earthquake in terms of the amplitude of the seismic waves recorded by seismographs.

Sikkim is the Indian state that is most prone to earthquakes. It is located in the northeastern part of the country and is situated in a seismically active region. The state has experienced several major earthquakes in the past, including the 1934 Bihar-Nepal earthquake and the 2011 Sikkim earthquake.

The term used to describe the sudden release of energy in the Earth's crust that causes an earthquake is hypocenter. It is the point within the Earth where the earthquake originates.

The 1934 Bihar earthquake, also known as the Bihar-Nepal earthquake, was a magnitude 8.4 earthquake that struck the Bihar province of British India and Nepal on January 15, 1934. It is considered to be the deadliest earthquake in India's history, causing an estimated 30,000 to 100,000 deaths.

The term used to describe the point on the Earth's surface directly above the hypocenter of an earthquake is epicenter. It is the point where the earthquake waves are strongest.

Kerala is the Indian state that is least prone to earthquakes. It is located in the southern part of the country and is situated in a seismically stable region. The state has not experienced any major earthquakes in the past.

The term used to describe the shaking of the ground caused by an earthquake is intensity. It is a measure of the strength of an earthquake at a particular location.

The 2015 Nepal earthquake, also known as the Gorkha earthquake, was a magnitude 7.8 earthquake that struck Nepal on April 25, 2015. It caused widespread damage and loss of life in Nepal, India, and China. The earthquake is considered to be the most recent major earthquake in India.

The term used to describe the energy released by an earthquake is magnitude. It is a measure of the strength of an earthquake based on the amplitude of the seismic waves recorded by seismographs.

Uttarakhand is the Indian state that is moderately prone to earthquakes. It is located in the northern part of the country and is situated in a seismically active region. The state has experienced several moderate earthquakes in the past, but no major earthquakes.