Earthquakesthe most deadly natural

Earthquakes
the most deadly natural hazards

Earthquakes. Being the most deadly natural hazards. Strike without any prior warning, leaving catastrophe in their wake with terrible loss of human lives as well as economic loss.

Technically, an earthquakes (also known as tremor, quake or temblor) is a kind of vibration through earth's crust. These powerful movements trigger a rapid release of energy that creates seismic waves that travel through the earth. Earthquakes are usually brief, but may repeat over a long period of time(earth science 2001).

Earthquakes are classified as large and small. Large earthquakes usually begin with slight tremors but rapidly take form of violent shock. The vibrations from a large earthquake last for few days known as aftershocks. Small earthquakes are usually slight tremors and do not cause much damage. Large earthquakes are known to take down buildings and cause death and injury (richter 1935). According to some statictics, there may be an average of 500,000 earthquakes every year but only about 100,000 can be felt and about 100 or so can cause damage each year.
The study of earthquakes is called seismology. Seismology studies the frequency , tpye and size of earthquakes. Earthquakes are measured using observations by seismometers. The magnitude of an earthquakes and its intensity is recorded on a numerical scale known as richter scale. On this scale, 3 or less is hardly noticeable. Earthquakes with magnitude of more than 6.5 can cause heavy damage(earth science. 2001)
The effects of an earthquake are strongest in the area which is near its epicenter. The extent of the earthquake vibration and further damage to the region is partly dependent on the features of the ground. The worst possible damage occurs in the densely populated areas where structures are not built to withstand intense shaking. Damage and loss of life incurred during earthquake is due to falling buildings and flying glass and objects. In certain areas, an earthquake can cause mudslides that can bury areas under it. Powerful submarine earthquakes cause tsunami or a chain of fast moving waves in the ocean that ripple outward from earthquake epicenter towards coastal areas causing surmountable damage(http\:www.USGS.Org). On an average , 1000 earthquakes with intensities of 5.0 or greater are recorded each year.

Hasil (Bahasa Indonesia) 1:

Gempa bumiKebanyakan bahaya mematikan alamiGempa bumi. Yang paling bahaya mematikan alami. Menyerang tanpa peringatan sebelumnya, meninggalkan bencana di belakang mereka dengan kerugian yang mengerikan dari kehidupan manusia serta kerugian ekonomi.Secara teknis, gempa bumi (juga dikenal sebagai tremor, gempa atau gempa) adalah semacam getaran melalui kerak bumi. Gerakan-gerakan ini kuat memicu pelepasan cepat dari energi yang menciptakan gelombang seismik yang perjalanan melalui bumi. Gempa bumi biasanya singkat, tetapi mungkin mengulangi selama jangka panjang waktu (ilmu bumi 2001).Gempa bumi diklasifikasikan sebagai besar dan kecil. Gempa bumi besar biasanya mulai dengan getaran sedikit tapi dengan cepat mengambil bentuk kekerasan shock. Getaran dari gempa besar yang berlangsung selama beberapa hari, dikenal sebagai gempa susulan. Gempa bumi kecil yang biasanya sedikit getaran dan tidak menyebabkan banyak kerusakan. Gempa bumi besar dikenal untuk mencatat bangunan dan menyebabkan kematian dan cedera (richter 1935). Menurut beberapa statictics, mungkin ada rata-rata 500.000 gempa bumi setiap tahun tetapi hanya sekitar 100.000 dapat dirasakan dan sekitar 100 atau begitu dapat menyebabkan kerusakan setiap tahun.Studi tentang gempa bumi disebut seismologi. Seismologi studi frekuensi, tpye dan ukuran gempa bumi. Gempa bumi diukur menggunakan pengamatan oleh seismometers. Besarnya gempa bumi dan intensitas yang dicatatkan pada skala numerik yang dikenal sebagai skala richter. Pada skala ini, 3 atau kurang ini hampir tidak terlihat. Gempa bumi dengan magnitudo lebih dari 6,5 dapat menyebabkan kerusakan berat (ilmu bumi. 2001)The effects of an earthquake are strongest in the area which is near its epicenter. The extent of the earthquake vibration and further damage to the region is partly dependent on the features of the ground. The worst possible damage occurs in the densely populated areas where structures are not built to withstand intense shaking. Damage and loss of life incurred during earthquake is due to falling buildings and flying glass and objects. In certain areas, an earthquake can cause mudslides that can bury areas under it. Powerful submarine earthquakes cause tsunami or a chain of fast moving waves in the ocean that ripple outward from earthquake epicenter towards coastal areas causing surmountable damage(http\:www.USGS.Org). On an average , 1000 earthquakes with intensities of 5.0 or greater are recorded each year.