logo
Seoul steps up sinkhole prevention efforts after fatal accidents

Seoul steps up sinkhole prevention efforts after fatal accidents

Straits Times27-04-2025

SEOUL - The Seoul Metropolitan Government announced on April 27 that it will introduce a ground subsidence monitoring network to prevent further sinkhole accidents.
Safety accidents involving sinkholes have drawn attention recently, after a 20-meter-wide and 18-meter-deep sinkhole formed in Gangdong-gu, eastern Seoul, on March 24, swallowing a motorcyclist who was declared dead the day after.
As numerous sinkhole sightings have been reported since, public concern over the phenomenon has grown significantly, with up to 50 locations in the capital city alone identified as at risk of sinkhole formation.
The new ground subsidence monitoring network, according to the city government, involves installing a bat-shaped column sensor 20 m underground. The sensor's antenna detects changes in geological layers within a 50 m radius and transmits the information to the central monitoring station. If anomalies are identified, appropriate measures will be taken by the authorities.
This is also an upgrade from the Ground Penetrating Radar system previously used by the city government, which emits high-frequency electromagnetic waves from the surface into the ground to detect sinkholes based on the reflected signals. Though the GPR system has been used nationwide, it is effective only up to around 2 m underground.
By May, the Seoul Metropolitan Government stated that it would install the new monitoring network at a construction site located near the site of the large sinkhole that formed in late March. At the time of that accident, construction work was underway near the site to extend Seoul Subway Line No. 9, which the city government suspended, noting that the project could not be ruled out as a possible cause of the sinkhole.
As most large sinkholes begin to form 10 meters underground, the new monitoring network is seen as a more effective way to prevent sinkhole accidents while overcoming the limitations of GPR surveys.
However, the new ground subsidence monitoring network is not a perfect solution. While GPR systems can be moved throughout Seoul on vehicles, the monitoring network can only take measurements in specific locations where sensors are installed.
Due to such limitations, the city government added that it will install the ground subsidence monitoring network system at large construction sites like the one in Gangdong-gu while expanding GPR surveys for other major excavation sites.
Separately from the city, the central government included 2.27 billion won (S$2.08 million) in its supplementary budget to support ground exploration efforts. However, it is unclear whether such spending will be effective, as even with additional equipment purchases, the limited depth of exploration reduces the overall effectiveness of these measures. This is because most of the sinkholes discovered so far have formed near large construction sites, where machines dig deep underground.
The central government will use part of its budget to invest in GPR systems. Aware of the technical limitations, the government considered introducing GPR systems that penetrate deeply underground - though the plan fell through earlier this year due to concerns that its performance had not yet been sufficiently verified. THE KOREA HERALD/ASIA NEWS NETWORK
Join ST's Telegram channel and get the latest breaking news delivered to you.

Orange background

Try Our AI Features

Explore what Daily8 AI can do for you:

Comments

No comments yet...

Related Articles

Justin Thomas: Oakmont can make players 'look stupid pretty fast'
Justin Thomas: Oakmont can make players 'look stupid pretty fast'

Reuters

time17 minutes ago

  • Reuters

Justin Thomas: Oakmont can make players 'look stupid pretty fast'

June 9 - Justin Thomas doesn't have a specific method for attacking Oakmont Country Club, widely considered to be one of the most difficult golf courses in the world, other than to maintain his patience. Thomas tied for 32nd the last time the U.S. Open was played at Oakmont in 2016. That year he carded three rounds of 3-over 73. The fourth was a 69 in the second round, which he called one of the best rounds of his life despite spraying his tee shots all over the course. "I think I hit four fairways, but I remember I hit seven greens and I shot 69. I chipped in three times. I was beyond exhausted when I got done," Thomas said Monday ahead of this week's U.S. Open. "I actually played with Brooks (Koepka) the first two days. I remember he was so pissed off. He just couldn't get over it." Thomas is anticipating long practice rounds this week, as players grind away trying to figure out every nuance of Oakmont's legendary greens. While he called them "some of the worst practice rounds of the year," Thomas also hopes that the lore of Oakmont gets in his competitors' heads. "Being perfectly honest and very selfish, I hope it psychs a lot of players out," he said. "It's a part of the preparation, like trying to go hit wedges or trying to get the speed of the greens or anything. It's getting a game plan for how you're going to approach the course mentally and strategically. "I understand this place is hard. I don't need to read articles, or I don't need to hear horror stories. I've played it. I know it's difficult. I also have faith that if I go play well and I'm driving the ball well and I'm hitting my irons like I know I can, I'm going to have a lot of birdie opportunities." Thomas, 32, hasn't enjoyed a ton of success at the U.S. Open, where his best finish was a tie for eighth at Winged Foot in 2020. He comes in ranked fifth in the world thanks to a win at a signature event at the RBC Heritage -- his first since 2022 -- and a pair of runner-up finishes this season. One of those came at the Truist Championship last month, but Thomas then missed the cut at the PGA Championship and is coming off a T31 at the Memorial. He arrived in Pennsylvania this week "shocked" to find how soft Oakmont's fairways still are due to the heavy rains the area has received. Thomas anticipates those receptive fairways and greens that still have some bounce in them will be much firmer come Thursday. And that's when the patience will need to come to the forefront. "If you just get lazy, like on any drive, any wedge shot, any chip, any putt, you can kind of look stupid pretty fast, especially at a place like this," he said. "I just feel like it's a great week to be in a great place mentally and very, very patient and kind of picking our spots out there." Oakmont has undergone some changes since 2016, when Dustin Johnson shot 4-under par to win. Thomas admits he doesn't remember enough to compare the conditions to that year, but he would be more than happy to replicate that Friday round four times -- even if it means going to battle against Oakmont's brutally long rough again. "I would prefer to not do that," he joked. "But if that means I shoot 69 every day, I'll take four fairways and seven greens right now." --Field Level Media

Donald Trump Weighs In on 'Civil War' Concerns
Donald Trump Weighs In on 'Civil War' Concerns

Newsweek

time17 minutes ago

  • Newsweek

Donald Trump Weighs In on 'Civil War' Concerns

Based on facts, either observed and verified firsthand by the reporter, or reported and verified from knowledgeable sources. Newsweek AI is in beta. Translations may contain inaccuracies—please refer to the original content. On Monday, President Donald Trump was asked about Democratic California Governor Gavin Newsom's remarks that his Republican administration wants "civil war on the streets" amid ongoing protests against raids by Los Angeles Immigration and Customs Enforcement (ICE). The president was asked by a reporter, "What do you make of the fact that [Newsom] says you want a civil war?" Trump responded, "No, it's the opposite. I don't want a civil war. Civil war would happen if you left it to people like him." REPORTER: Gavin Newsom says you want a Civil War. TRUMP: "It's just the opposite, I don't want a Civil War. Civil War would happen if you left it to people like him." — Breaking911 (@Breaking911) June 9, 2025 This is a breaking news story. Updates to follow.

DOWNLOAD THE APP

Get Started Now: Download the App

Ready to dive into the world of global news and events? Download our app today from your preferred app store and start exploring.
app-storeplay-store