The soil around the area Porong increasingly alarming. Not only bursts of gas and mud that makes the area was filled with methane gas, but the decline in land (subsidence) that occurred in the region threatens the region Porong.
The last condition, shop in the east side of Highway Porong, Jatirejo Village, District Porong, sinkhole. So feared decline in soil will spread to curved arteries, because the location was amblesnya shop is only approximately 15 meters from the road that connects the Surabaya-Malang.
Monitoring in the field, building a sinkhole that was once a shop that used to sell fruit. While part of the sinkhole in the middle of the building with a diameter of seven meters. In fact, floor and foundation are no longer visible because it ambles.
While building the wall hanging over pools of water that continues to give off bursts of gas and water. The smell of methane gas was starting to shine though is eight feet from where amblesnya building.
"We are surprised to hear loud sounds such as the building collapsed. After I saw was the building sinkhole," said Sutikno, local people who know the incident, on Wednesday (20/10/2010).
Not only threaten Highway Porong, amblesnya building was also feared spread to the railway, a distance of approximately 10 meters east side of the shop building. Meanwhile, around the site amblesnya building, fitted lines are prohibited from approaching the site.
Knowing the existence of a sinkhole building adjacent to the railway tracks, PT KA Daops VIII officer directly review the location. They determine whether the building amblesnya also spread to rail KA.Selain, the officers also check if there are signs of cracks that could threaten rail land.
Railway Head Resort Sidoarjo Bambang Slamet that review site said, officers also checked the ground with a distance of estrangement sleepers. From the result by the temporary, there are no signs of disrupted rail from sinkhole building it. "For a while the rails are still safe," he said.
However, he added, his party remained wary of other impacts, such as rails bent or sinkhole. For this reason, PT KA alerting the two officers to monitor progress for 24 hours. PT KA also has not reduced the speed of the train as it passed in the region.
Genesis building sinkhole was not the first time. Previously, the wall of a house belonging to one citizen Jatirejo. But the distance is still quite far from Highway Porong. Similarly, the house belonging to citizens of West Siring, also collapsed because of subsidence and the distance is still far from Highway Porong.
While the shop building a sinkhole was only approximately 15 meters from Highway Porong. This is what is feared will spread to Porong Highway.
Confirmed separate, public relations staff BPLS Kusairi Akhmad said, subsidence occurred at the location of long bursts. Shot of the previous is dead and is now active again.
"Subsidence is the material out of water and methane gas. But we have not measured how metannya gas levels," he said.
Subsidence was, he added, occurred because the existing subsurface cavity (gerowong) Lapindo mudflow impact that continues to gush. So when on it there is a direct burden sinkhole. It includes local subsidence subsidence. Therefore, he ensures no harm both land transportation that.