KERALA PSC / PHYSICAL GEOGRAPHY / EARTHQUAKES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE

 

KERALA PSC / PHYSICAL GEOGRAPHY / EARTHQUAKES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE

KERALA PSC / PHYSICAL GEOGRAPHY / EARTHQUAKES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE

·      The sudden violent shaking of a part of the earth is called an earthquake

·      An earthquake is generally accompanied by a rumbling sound and tremors

·      Earthquakes which originates naturally below the surface sending out a series of shock waves

·      Earthquakes are frequently associated with faults. The place of origin of an earthquake inside the earth is called its focus

·      Epicentre is the point on the earth’s surface vertically above the focus. On the earth’s surface the maximum damage is caused at the epicenter.

·      Most of the earthquakes originate at a depth of about 60km below the surface of the earth. The point of origin of an earthquake in the interior of the earth is called the seismic focus.

·      Seismology is the study of earthquakes and their impact. There are two corresponding measures of the severity of an earthquake: intensity and magnitude

·      Intensity is the measure of the local effect which varies according to both the distance from the source of the earthquake and the intrinsic strength of the earthquake. The intensity is expressed in Points

·      Seismic waves are of three main types, namely P waver (primary) S waves (Secondary) and L wave (Surface or long) 

·      About 68% of all earthquakes are observed in the vast region of the Pacific Ocean as a ‘Ring of fire’

·      Some earthquakes are caused by the movement of lava beneath the surface of earth during volcanic activity

·      The Kutch earthquake (1819), the Assam earthquake (1897), the Kangra earthquake (1905), the Bihar earthquake (1934), the Lathur, Maharashtra earthquake (1993) and the Gujarat(Kutch) earthquake (2001) are the well-known examples of earthquakes in India.

KERALA PSC / PHYSICAL GEOGRAPHY / EARTHQUAKES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE