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A part of the hotel damaged by the tsunami that hit Tanjung Lesung in Indonesia.
(Credit: Ed Wray / Getty Images)
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Residents inspect a tsunami-damaged home in Carita, Indonesia, on Sunday, December 23, 2018, a day after the area was hit after an eruption from the Anak Krakatau volcano.
(Credit: AP)
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A man reacts after identifying his relative among the bodies of the tsunami victims in Carita, Indonesia, on Sunday, December 23.
(Credit: Fauzy Chaniago / AP)
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People search for relatives among the bodies of the tsunami victims.
(Credit: Fauzy Chaniago / AP)
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A villager walks past vehicles damaged by a tsunami in Carita, Indonesia.
(Credit: Dian Triyuli Handoko / AP)
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A resident passes tsunami-damaged buildings in Carita, Indonesia, Sunday, Dec. 23, 2018 (Credit: AP)
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Rescuers search for survivors along the coast in South Lampung, South Sumatra.
(Credit: FERDI AWED / AFP / Getty Images)
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A man walks amid the rubble of damaged buildings in Carita, Indonesia.
The tsunami was likely caused by a combination of landslides due to a volcanic eruption.
(Credit: AFP / Getty)
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A rescuer participates in a search operation for victims of the tsunami in Carita, Indonesia.
(Credit: Fauzy Chaniago / AP)
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Officials search the remains of damaged buildings in Carita, Indonesia.
(Credit: AFP / Getty)
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Debris covers a property that was damaged by the tsunami in Indonesia.
(Credit: Fauzy Chaniago / AP)
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Rescuers search for survivors along the coast in South Lampung, South Sumatra.
(Credit: FERDI AWED / AFP / Getty Images)
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A damaged vehicle is seen amid the remains of buildings along Carita Beach, Indonesia, on December 23, 2018, a day after a tsunami struck the area, following an eruption of the Anak Krakatau volcano.
(Credit: SEMI / AFP / Getty)
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Residents evacuated from damaged homes.
(Credit: SEMI / AFP / Getty)
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Debris and furniture inside a damaged home in Carita after the area was hit by a tsunami on December 22 following an eruption of the Anak Krakatoa volcano.
(Credit: DEMY SANJAYA / AFP / Getty Images)
(CNN) -
Tsunamis are formed by a displacement of water caused by a landslide, an earthquake, a volcanic eruption, or a boundary slip between two of the earth's tectonic plates (which are 15 to 200 rock plates). meters thick supporting Earth's continents and seas in a much warmer underground ocean of semi-solid material).
Tsunamis can travel at more than 800 kilometers per hour in the deepest point of the water, but they slow down as they get closer to shore, eventually reaching shore at speeds between 20 and 30 miles per hour.
The energy of the wave speed is transferred to the height and brute force as it approaches the shore.
LEE: Earthquake shakes New Caledonia;
there is a threat of tsunami
According to the Tsunami Historical Database, these events that can cause damage or death near their source occur approximately twice a year.
Tsunamis that can cause damage or deaths on nearby coasts (more than 1,000 km away) occur twice in a decade.
READ: What is a tsunami, why do they form and why can they be so dangerous?
These are some of the deadliest tsunamis in recent history, which were preceded by strong earthquakes.
November 1, 1755 -
An estimated 60,000 people were killed when an earthquake hit Lisbon, Portugal, and cause a tsunami.
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August 27, 1883 -
An estimated 36,000 people died when the Krakatau volcano erupted causing a tsunami on the Indonesian islands of Java and Sumatra.
June 15, 1896 -
An estimated 28,000 people died when a 8.5 magnitude earthquake struck Sanriku, Japan, causing a devastating tsunami.
December 28, 1908 -
An estimated 70,000 to 100,000 people died when a 7.2 magnitude earthquake struck Messina, Italy, causing a tsunami in the Strait of Messina.
This is how an Indonesian island was left after the earthquake and tsunami that devastated it
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A powerful 7.5 magnitude earthquake struck the Indonesian island of Sulawesi last Friday, causing a tsunami and killing more than 800 people.
Warning: The following images may contain disturbing material.
Discretion is advised.
In the photo, people walk through the Talise Beach area of the city of Palu on Monday, October 1.
(Credit: Eko Siswono Toyudho / Anadolu Agency / Getty Images).
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A ship was stranded off the coast of Wani, Indonesia.
(Credit: Antara Photo / Reuters)
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A man takes a photo of a damaged bridge in Palu, the provincial capital of Sulawesi, on October 1.
(Credit: Carl Court / Getty Images)
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Houses destroyed in the city of Palu on October 1.
(Credit: Adek Berry / AFP / Getty Images)
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People pass by a boat and other debris in Palu on October 1.
(Credit: Jewel Samad / AFP / Getty Images)
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A girl cries outside the Palu airport after it reopened on October 1.
Hundreds of people came to this place to reach a quota in the few flights that leave the area.
(Credit: Ulet Ifansasti / Getty Images)
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The ruins of a collapsed mosque are seen in Palu on October 1.
(Credit: Jewel Samad / AFP / Getty Images)
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Another scene of devastation in Palu.
Homes, businesses and vehicles along the coast were washed away by the violent waves of the tsunami.
Roads and bridges were destroyed.
(Credit: Jewel Samad / AFP / Getty Images)
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Rescuers attempt to free a 15-year-old survivor who was trapped in the flooded ruins of a collapsed house in Palu on September 30.
(Credit: Arminacs Wilander / EPA-EFE)
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Rescuers remove a survivor from a collapsed restaurant building in Palu.
(Credit: Mast Irham / EPA-EFE)
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Palu residents try to rescue their belongings on September 29.
(Credit: Muhammad Rifki / AFP / Getty Images)
May 22, 1960 -
Approximately 1,500 people died when a 9.5 magnitude earthquake struck Chile and caused a tsunami.
March 28, 1964 -
An estimated 128 people were killed when a magnitude 9.2 earthquake struck Prince William Sound, Alaska, causing a tsunami.
August 16, 1976 -
An estimated 4,000 to 8,000 people are killed when a magnitude 8.0 earthquake struck the Philippines and caused a tsunami.
July 17, 1998 -
Approximately 2,200 people were killed when a 7.0 magnitude earthquake struck Papua New Guinea and caused a tsunami.
December 26, 2004 -
An estimated 227,898 people died when a 9.1 magnitude earthquake struck Sumatra, Indonesia, and triggered a subsequent tsunami in 14 countries in South Asia and East Africa.
October 25, 2010 -
An estimated 449 people died when a magnitude 7.7 earthquake struck Indonesia and caused a tsunami.
March 11, 2011 -
A 9.1 magnitude earthquake occurred 371 kilometers northeast of Tokyo.
The earthquake caused a tsunami with 30-foot waves that damaged several nuclear reactors in the area.
The combined total of confirmed deaths and missing is over 22,000 (nearly 20,000 deaths and 2,500 missing).
(Source: Japan Fire and Disaster Management Agency)
September 28, 2018 -
More than 2,100 people were killed when a 7.5 magnitude earthquake struck the Indonesian island of Sulawesi and caused a tsunami.
December 22, 2018 -
A tsunami with waves of up to three meters hits Pandeglang, Serang and southern Lampung, Indonesia, leaving more than 430 dead, 148 missing and 16,000 displaced.
Officials believe the tsunami was caused by a series of underwater landslides triggered by a volcanic eruption.
tsunami