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Author Topic: Eureka! Fault that triggered quake discovered in northern Bohol  (Read 3491 times)

hubag bohol

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Eureka! Fault that triggered quake discovered in northern Bohol
« on: October 22, 2013, 06:08:18 PM »
By HOWIE SEVERINO, GMA News
October 21, 2013 11:14pm


Anonang, BOHOL – Right after the October 15 earthquake that laid waste to much of Bohol, residents of this remote northern barangay noticed a long earthen wall that suddenly appeared in their community.

A team of state volcanologists confirmed Monday night that the newly formed natural structure represents a previously unknown fault that triggered the magnitude 7.2 earthquake.
 
“When we saw it, eureka! This is it,” said Dr. Teresito Bacolcol, the scientist who led the Phivolcs team on Monday to check out sightings of the lengthy earthen wall, which turned out to be the “face” of a fault that currently does not exist on the active fault map of the Philippines.
 
“We are 100 percent sure that this is the generator [of the earthquake],” said Bacolcol, citing its proximity to the epicenter near the boundary between Sagbayan and Catigbian towns.
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hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #1 on: October 22, 2013, 06:08:50 PM »
The fault had moved six days ago, triggering the terrifying tremor that felled churches, left nearly 200 dead, and rendered scores homeless.
 
The wall, or the face of the fault, is the edge of a large area of land that had been thrust upwards as high as three meters. It stretched as far as the eyes can see, cutting off roads and numerous trails. The fault line's direction runs northeast to southwest through this barangay, which is located in the municipality of Inabanga.

"Nahati ang Bohol," said Leonila Divinagracia, a barangay kagawad here, observing that a wide swath of the province was now more elevated with a clear demarcation.

Still unnamed, the prominent formation here is unique in the annals of the country's recent geological history. It’s considered a “reverse fault” because of the vertical surface rupture, a sign of the enormous energy packed by last Tuesday's cataclysm. Less powerful quakes cause land to sink rather than rise.
 
The last great earthquake in the country, in northern Luzon in 1990, was caused by a lateral (side to side) movement of a fault, and did not leave a similarly large mark on the terrain.
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #2 on: October 22, 2013, 06:09:37 PM »
Searching for fault line

Before Monday, the fault's location had been a mystery, after the East Bohol Fault near the southern coast had earlier been discounted as the source of the earthquake. "We thought the fault could be offshore or somewhere in the north of the island," said Bacolcol.
 
Bacolcol and his team of experts had been looking for the fault’s face for days, narrowing their search to the vast “zone of aftershocks” that stretched from the northwest part of Bohol island down to the southern coastal town of Loon, where a centuries-old church was reduced to a heap of rubble.
 
If they had not found the fault, or if it was a "blind fault" with no surface manifestation, the Phivolcs team would have determined the fault line only by analyzing the pattern of aftershocks, according to a member of the team, adding that “it would have taken a lot longer.”
 
Following a lead given by this reporter, who had accompanied residents of Inabanga town to the fault on Sunday, Bacolcol and his team spent much of Monday documenting a five-kilometer stretch of the fault, and they were far from finished. They are planning to return on Tuesday to trace the fault wherever it led, which could be the sea.
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #3 on: October 22, 2013, 06:09:55 PM »
Historical earthquake data around the globe shows that an earthquake of magnitude 7.2 can create a visible fault line as long as 100 kilometers.
 
In the meantime, the scientists' visit to Anonang gave a measure of relief to residents who didn’t know what to make of the massive change to their land.

“We have been scared. What if there are more faults to come? Should we leave?” asked Felix Caray, barangay captain of Anonang, one of many communities across Bohol where people are sleeping outdoors out of fear.
 
Bacolcol’s team assured them that this will be the one and only fault here, and it may be generations before another earthquake occurs. They also advised residents not to build any houses within five meters of the fault line.
 
Late Monday night at the Phivolcs station in Tagbilaran, Bacolcol and his team were still busy preparing maps, data, and photos of their new discovery for the Phivolcs central office.
 
“This is the holy grail of active fault mappers,” said Bacolcol, who will submit their findings for a revision of the Philippine fault map. “Naiiyak ang team nang makita nila.” – DVM/YA, GMA News
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #4 on: October 24, 2013, 06:33:48 AM »
The wall, or the face of the fault, is the edge of a large area of land that had been thrust upwards as high as three meters. It stretched as far as the eyes can see, cutting off roads and numerous trails. The fault line's direction runs northeast to southwest through this barangay, which is located in the municipality of Inabanga.

Pwede ni himooon nga tourist attraction...
...than to speak out and remove all doubt." - Abraham Lincoln

Chongki

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #5 on: October 24, 2013, 07:18:38 AM »
pwede ingan .... bacolcols fault

islander

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #6 on: October 24, 2013, 09:20:42 AM »
a very attractive name for tourists tuod.
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

wardiflex

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #7 on: October 24, 2013, 09:51:34 AM »
ayay mahati jud?
kinsa tong mag pa pintal sa ilang balay etc., just inform me, naa koy kaila nga d best.09487352092

islander

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #8 on: October 24, 2013, 10:03:52 AM »
di man gyod ko scientist-geologist, wards, pero syaro na man gyod pod kun mahati ang bohol.  morag cake nga gitunga.  because one side of the fault line rose to about 3 meters, i believe mora lang tingali nig up-and-down, di mahati.
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

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #9 on: October 24, 2013, 11:32:26 AM »
pwede ingan .... bacolcols fault
a very attractive name for tourists tuod.

I second the motion. Dapat credited si Bay Chongks once i-adopt ning iyang ideya...
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #10 on: October 24, 2013, 11:33:59 AM »
ayay mahati jud?
di man gyod ko scientist-geologist, wards, pero syaro na man gyod pod kun mahati ang bohol.  morag cake nga gitunga.  because one side of the fault line rose to about 3 meters, i believe mora lang tingali nig up-and-down, di mahati.

Maayo lagi unta kon naay picture. Ikaw, Madame, kugihan man jud kang maniksik...
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #11 on: October 24, 2013, 11:36:46 AM »
Mao man tingali ni ang mahitabo...


...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #12 on: October 24, 2013, 11:38:26 AM »
Ang giingon nilang "face of the fault" mao tingali ning gitawag diri sa diagram og "fault plane":


...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #13 on: October 24, 2013, 11:46:25 AM »
Fault types





Asa kaha aning mga klaseha ang Bacolcol's fault...
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #14 on: October 24, 2013, 11:53:22 AM »
Still unnamed, the prominent formation here is unique in the annals of the country's recent geological history. It’s considered a “reverse fault” because of the vertical surface rupture, a sign of the enormous energy packed by last Tuesday's cataclysm. Less powerful quakes cause land to sink rather than rise.

Hmm, it must then correspond to the one on the right-hand side of the following diagram:


...than to speak out and remove all doubt." - Abraham Lincoln

islander

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #15 on: October 24, 2013, 10:10:10 PM »
da uy, cake na man hinoon akong tinan-awan uy.  lisod gyod ning sul-an tag ngipon uy.
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

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #16 on: October 25, 2013, 06:05:39 AM »
da uy, cake na man hinoon akong tinan-awan uy.  lisod gyod ning sul-an tag ngipon uy.

Hmm, Bacolcol's fault a.ka. Islander's cake... ;D
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #17 on: October 25, 2013, 06:09:15 AM »
Philippine earthquake creates miles-long rocky wall
By AFP Published: October 25, 2013



This photo taken on October 22, 2013 shows residents standing next to a huge crack creating a rock wall in the village of Anonang, Inabanga town, Bohol province brought about by the 7.2-magnitude quake which hit the province October 15. PHOTO: AFP


PHILIPPINES: A deadly earthquake that struck the Philippines last week created a spectacular rocky wall that stretches for kilometres through farmlands, astounded geologists said Thursday.

Dramatic pictures of the Earth-altering power of the 7.1-magnitide quake have emerged as the government worked to mend the broken central island of Bohol, ground zero of the destruction.

A “ground rupture” pushed up a stretch of ground by up to three metres (10 feet), creating a wall of rock above the epicentre, Maria Isabel Abigania, a geologist at the Philippine Institute of Volcanology and Seismology, told AFP.
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #18 on: October 25, 2013, 06:10:13 AM »
“Our people have walked five kilometres (three miles) so far and not found the end of this wall,” she said, as experts from the institute surveyed the damage.

“So far we have not gotten any reports of people getting swallowed up in these cracks. The fault runs along a less-populated area.”

A photograph on the institute’s website showed part of the rock wall grotesquely rising on farmland behind an unscathed bamboo hut.

Another house was shown lodged in a crack of the Earth, while a big hole on the ground opened up at a banana farm.

Renato Solidum, head of the institute, said the ground fissures from the quake, which killed 198 people on Bohol and two nearby islands, were among the largest recorded since the government agency began keeping quake records in 1987.
...than to speak out and remove all doubt." - Abraham Lincoln

hubag bohol

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Re: Eureka! Fault that triggered quake discovered in northern Bohol
« Reply #19 on: October 25, 2013, 06:11:07 AM »
“Most of our other quake records show a lateral (sideways) tearing of the earth, though we’ve also had coral reefs rising from the sea,” he said, citing a 6.7-magnitude earthquake that hit the central island of Negros last year.

The Philippines lies on the so-called Pacific Ring of Fire made up of chains of islands created by volcanic eruption that are also frequently hit by earthquakes.

President Benigno Aquino told reporters Thursday the institute had assured him the worst was over, though Bohol would continue to be hit by aftershocks over the next few weeks.

“There is no immediate danger” either from the aftershocks or from the ground fissures, said Aquino, who slept in an army tent there overnight Wednesday in solidarity with the survivors.
...than to speak out and remove all doubt." - Abraham Lincoln

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