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Author Topic: Scores of sinkholes found in Bohol  (Read 2033 times)

islander

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Scores of sinkholes found in Bohol
« on: November 01, 2013, 06:55:51 PM »
Scores of sinkholes found in Bohol

By Carmel Loise Matus
Inquirer Visayas
Friday, November 1st, 2013



A family of four died in this sinkhole in Antequera, Bohol. Contributed Photo Paula Cacho

TAGBILARAN CITY, Philippines—Close to 100 sinkholes have been discovered in nine towns and one city in Bohol, whose name is derived from the local word for hole,  following the magnitude 7.2 earthquake that devastated the province on October 15.

Not all of these sinkholes posed a threat to the public unless houses or other structures were built directly on top of or very near them, environment officials said.

This was the reason why 200 families in the Poblacion Uno area of Tagbilaran City, the provincial capital, were asked to evacuate. Their homes were found to have been built on the roof of a newly discovered sinkhole.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment


islander

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Re: Scores of sinkholes found in Bohol
« Reply #1 on: November 01, 2013, 06:56:40 PM »
Bohol Governor Edgar Chatto said an eight-member team from the Mines and Geosciences Bureau was assessing the sinkholes with the use of ground-penetrating radar or GPR to identify those that pose a threat to the public.

If any engineering intervention is required to make an area safe, Chatto said, it would have to wait for a map of the sinkholes to be completed  by the first quarter of 2014.

“Don’t worry… Bohol is a very safe place to stay,” he told reporters on Friday. “Let us listen to the scientists and experts.”
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #2 on: November 01, 2013, 06:57:50 PM »
The regional office of the Department of Environment and Natural Resources in Central Visayas has identified nearly 100 other sinkholes in nine other municipalities in Bohol apart from the one in Tagbilaran.

These are in the towns of Baclayon, Corella, Alburquerque, Panglao, Dauis, Balilihan, Batuan, Loon and Carmen, said Ed Llamedo, the regional DENR information officer.

He said these sinkholes had been existing as long as 5.3 million years ago but surfaced only after the October 15 earthquake that killed more than 200 persons and destroyed or damaged roads and bridges, churches  and many public and private buildings as well as houses. The destruction has been tentatively estimated at P5 billion.

The name Bohol is derived from the local word “bo-ho,” which means hole.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #3 on: November 01, 2013, 06:58:38 PM »
Llamedo urged local officials to undertake forced evacuations where necessary, monitor the sinkholes, put up signs alerting the public to their existence and to cordon off open sinkholes.

Filling the sinkholes with concrete would not be advisable before the MGB gets a complete picture of the extent of a sinkhole, he said.

Llamedo explained that their GPR equipment has the capability to produce an image of the diameter, depth, cave pillar and extent of the sinkholes.

The DENR issued a Geohazard Threat Advisory on October 28, recommending the preemptive evacuation of 200 families whose houses were built on the cave roof of the sinkhole found in Tagbilaran City that ate up the interior road of Purok 7.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #4 on: November 01, 2013, 06:59:38 PM »
Llamedo said the Tagbilaran sinkhole opening measures about 3 meters by 4 meters  and has a depth of 5 meters.

He said the cave roof was very thin “at 0.5 meters” which might collapse either by additional pressure and weight by settlement or continuous ground shaking caused by the aftershocks.

“There is very high [probability] that the sinkholes will increase in size, so residents are urged to immediately evacuate to safer ground,” he told the Inquirer.

Environment Secretary Ramon Paje has said the provinces of Bohol and Cebu, along with Baguio City, have foundations of solid limestone, which have weathered and carved out naturally through time, making these prone to sinkholes.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #5 on: November 01, 2013, 07:00:58 PM »
He said sinkholes already existed in most areas of Bohol, Cebu and Baguio City, but were just not apparent.

In a lay person‘s view, he said, a sinkhole is a visible, deep depression on the ground. But in geology, “it is a vacuum beneath the ground or top soil waiting for an occurrence (earthquake or heavy rain) to rupture.”

According to the US Geological Survey Web site, “sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns develop underground.”


http://newsinfo.inquirer.net/
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

hofelina

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Re: Scores of sinkholes found in Bohol
« Reply #6 on: November 01, 2013, 09:00:46 PM »
whoever authorities are in charge of this job, they should work diligently and proclaim which areas are habitable or non-habitable at all. May Cousin whose house is not far from the St Joseph cathedral has a nervous breakdown now.

Lorenzo

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Re: Scores of sinkholes found in Bohol
« Reply #7 on: November 01, 2013, 09:01:22 PM »
"let us just listen to the scientists and the experts..."

and their answers usually lead to idiopathy. come what may, we just have to adapt to this new situation.

given, it is a miracle that there was a few fatalities as compared to other areas of the country or around the world..that is associated with earth quakes.

islander

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Re: Scores of sinkholes found in Bohol
« Reply #8 on: November 02, 2013, 11:45:31 AM »
More sinkholes reported in Bohol

By Czeriza Valencia
(The Philippine Star) | Updated November 2, 2013



Photo taken Oct. 30 shows residents in Catigbian, Bohol standing next to a 100-meter-deep sinkhole which appeared following the magnitude 7.2 earthquake. JOVEN CAGANDE

MANILA, Philippines - Amid reports that sinkholes have appeared in southwestern Bohol, the Mines and Geosciences Bureau (MGB) yesterday said 20 sinkholes have been confirmed so far and more could turn up.

“Based on our geological mapping, there are still more,” said MGB director Leo Jasareno. “There are numerous sinkholes in the province based on our map interpretation.”

Most the sinkholes have an area of four meters by five meters and a depth of two meters and are located in the middle of barangays.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #9 on: November 02, 2013, 11:46:36 AM »
Some of the sinkholes, Jasareno said, pose no immediate danger to residents unless the capping or the topsoil of the sinkhole weakens.

“These sinkholes may still widen and deepen but this will happen in geologic time, many years not in our lifetime,” he said.

He said a particularly large sinkhole that has not yet caved in was discovered in a school ground in Panggangan Island through the use of ground penetrating radar.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #10 on: November 02, 2013, 11:50:24 AM »
Radar imagery showed  that the sinkhole has a length of 100 meters and a depth of five to 10 meters.

“The sinkhole is located in the school grounds but is not directly under the school building,” said Jasareno.

The MGB, however, recommended the immediate evacuation of residents of Barangay Poblacion 1 in Tagbilaran City after a 5-meter by 4-meter sinkhole with a depth of two meters appeared in the barangay.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #11 on: November 02, 2013, 11:51:26 AM »
“We will recommend immediate evacuation in areas deemed dangerous,” said Jasareno.

The MGB chief noted that 80 percent of Bohol is made up of limestone, causing natural depressions like sinkholes to cave in as limestone deposits underneath erode.

The agency intends to complete the survey of sinkholes in Bohol by the end of the year.

It has already begun surveying sinkholes in Cebu City.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Scores of sinkholes found in Bohol
« Reply #12 on: November 02, 2013, 11:53:00 AM »
“We have started the survey in Cebu, but there is no immediate danger in the province,” he said.

Compared to numerous sinkholes that appeared in Bohol after the magitude 7.2 quake rocked the province, only one turned up in Cebu.

After the powerful earthquake struck the provinces in mid-October, a 15-meter wide sinkhole destroyed at least five houses.

The MGB is keeping an eye on Cebu because “all of Mactan” is limestone underneath.


http://www.philstar.com/
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

insurectus

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Re: Scores of sinkholes found in Bohol
« Reply #13 on: November 02, 2013, 11:56:19 PM »
that proves nga daghan tuod og langob sa tagbilaran mao tingali wala high rise building gipangtukod and kadto nakit-an diha dapit sa cathedral naa lagi to hagdanan basin naay nag mina sauna diha

Lorenzo

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Re: Scores of sinkholes found in Bohol
« Reply #14 on: November 04, 2013, 10:14:54 PM »
interesting.

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