Earthquake Resistant Houses Are a Solution to Earthquake Disasters

Acting Head of the Center for Disaster Data, Information and Communication of the National Disaster Management Agency (BNPB), Abdul Muhari, appealed to all parties to strengthen the structure of the house so that it does not easily collapse when there is an earthquake. The call was made after an earthquake measuring 4.8 on the Richter scale hit Bali and damaged 1,987 houses.

“With details, 347 houses were heavily damaged, 135 houses were moderately damaged, and 1,415 houses were slightly damaged,” said Abdul Muhari in an online press conference, Friday (22/10) afternoon.

Acting Head of the Center for Disaster Data, Information and Communication of the National Disaster Management Agency (BNPB), Abdul Muhari.  Friday (10/22/2021) (Photo: Screenshot)

Acting Head of the Center for Disaster Data, Information and Communication of the National Disaster Management Agency (BNPB), Abdul Muhari. Friday (10/22/2021) (Photo: Screenshot)

Strengthening building structures, said Abdul, is not only needed for houses to be built in the future, but also for other houses that have already been built without paying attention to earthquake-resistant building codes.

“We see the level of vulnerability of our buildings which of course will also have an impact on the level of human vulnerability in the building that needs our attention and attention,” said Abdul Muhari.

He acknowledged the need for efforts to educate the public to be able to build earthquake-resistant houses with simple, low-cost methods that can be done by the community themselves.

Mitigation with Earthquake Resistant Houses

Professor Fauzan from the Andalas University Disaster Study Center, West Sumatra explained the application of ferrocement technology using woven wire.  Friday, (10/22/2021) (Photo: Screenshot)

Professor Fauzan from the Andalas University Disaster Study Center, West Sumatra explained the application of ferrocement technology using woven wire. Friday, (10/22/2021) (Photo: Screenshot)

Professor Fauzan from the Center for Disaster Studies at Andalas University, West Sumatra, said that strengthening people’s houses to be earthquake-resistant can use technology ferroocement screen or woven wire covered with cement mortar. As long as the house is still erect after the earthquake, the building can still be repaired and strengthened.

Woven wire on the market is sold at a price of around Rp. 15 thousand per meter, nailed to a brick or adobe wall at the corner of the wall, as well as at the top and bottom of the wall and then plastered.

“The advantage is strong, we have tested it on a vibrating table, it is cheap, 30 percent cheaper than if we use other reinforcement, most of the other reinforcement uses iron,” Fauzan said at the press conference.

Ferrocement can also be applied to repair cracked house walls by means of the old plaster around the cracks being peeled off approximately 50 centimeters, then the cracked part is filled with cement water. After the gap is tight, the woven mate is installed and then the wall is re-plastered with a mixture of one cement versus three sand.

BMKG analysis

Coordinator for Earthquake and Tsunami Mitigation, Meteorology, Climatology and Geophysics Agency (BMKG) Daryono explained that the Agung-Batur earthquake could cause damage due to shallow earthquakes due to active spreading activity between Mount Agung and Mount Batur. The depth of the hypocenter of the earthquake was 10 kilometers, the buildings were substandard, and the soft soil effect of the lava deposits made the earthquake shock feel very strong.

An earthquake measuring 4.8 on the Richter scale rocked Bali and its surroundings on Saturday (16/10) at 04.18 WITA.  (Photo: Courtesy/Basarnas)

An earthquake measuring 4.8 on the Richter scale rocked Bali and its surroundings on Saturday (16/10) at 04.18 WITA. (Photo: Courtesy/Basarnas)

The earthquake occurred on October 16, 2021 at 16.18 WITA. The shocks covered Karangasem, Bangli, Gianyar, Buleleng, Badung, Denpasar and Tabanan. The shaking was wide enough to reach Banyuwangi in the west and all of East Lombok.

The Great-Batur Earthquake not only caused damage to houses, but the earthquake also triggered side effects such as landslides and falling rocks.

As a mitigation effort, people living in the central mountains of Bali not only need to build earthquake-resistant or friendly buildings, but also have to pay attention to the geology of the environment based on earthquake risk. One of them is by not building houses on steep hillsides that are prone to landslides and rock collapse.

A minivan is crushed by a block of concrete that fell from a building after an earthquake rocked Bali, October 13, 2011. (Photo: REUTERS/Zul Eduardo)

A minivan is crushed by a block of concrete that fell from a building after an earthquake rocked Bali, October 13, 2011. (Photo: REUTERS/Zul Eduardo)

History of Earthquake in Bali

According to BMKG records, the history of earthquakes in Bali has often caused follow-up impacts in the form of landslides that claimed many lives. The Bali earthquake of November 22, 1815 caused the slopes of the hills in Bali to collapse and claimed lives. Cracks in the ground are scattered in many places, some even cut into Lake Tamblingan and cause massive flooding.

The Bali earthquake on January 21, 1917, about 80 percent of the number of victims of the earthquake was caused by landslides with a total of 1,500 people died.

The Seririt earthquake of July 14, 1976 caused liquefaction and triggered many soil fractures and landslides. Soil cracks and cliff slides were reported in Pupuan, Tabanan, and Bukit Geger areas, Buleleng Regency. The death toll from the Seririt earthquake reached 559 people with more than 30 thousand houses damaged. [yl/ah]

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