Nav: Home

Mw 5.4 Pohang earthquake tied to geothermal activity?

April 26, 2018

The Mw 5.4 Pohang earthquake that occurred near a geothermal site in South Korea last year was likely triggered by fluid injection at the geothermal plant, two separate reports conclude. While activity from Enhanced Geothermal System (EGS) sites - which inject large amounts of water underground - has been associated with much smaller earthquake events, the magnitude of the 2017 temblor would make it the largest-known earthquake induced at an EGS site. The Pohang earthquake was the most damaging quake in South Korea since the first seismograph was installed in 1905. After its eruption in November 2017, researchers began to assess whether the event was induced by activity at a nearby EGS location, where many thousands of cubic meters of water had been injected at high pressure starting in 2016. Though induced earthquakes have been well-established in places like Oklahoma, such regions involve oil and gas extraction, not geothermal activity; the latter has not been suspected of inducing quake activity much above Mw 3.4. Here, to illuminate the relationships between injection at the South Korean EGS site and the Pohang quake, Kwang-Hee Kim and colleagues created a local earthquake catalog that allowed them to analyze these relationships closely. Combined with analysis of data on foreshocks and aftershocks surrounding this event, they suggest the quake was probably or almost certainly induced, and by fluid injected directly into a critically stressed subsurface fault zone. Based on the fluid volume, the authors add, injected fluid volumes much smaller than predicted by theory in some circumstances can trigger a relatively large earthquake. In a second paper investigating the likelihood of this quake having been induced, Francesco Grigoli et al. also conclude it probably was, though based on a different data set that included satellite-based information and a range of seismological observations. The 2017 earthquake transferred static stress to larger nearby faults, they add, potentially increasing the seismic hazard in the area more broadly. If the 2017 event was truly induced, as these two studies indicate, the Pohang earthquake would be the largest quake induced by geothermal energy exploitation in history.
-end-


American Association for the Advancement of Science

Related Relationships Articles:

'Feeling obligated' can impact relationships during social distancing
In a time where many are practicing 'social distancing' from the outside world, people are relying on their immediate social circles more than usual.
We can make predictions about relationships - but is this necessary?
'Predictions as to the longevity of a relationship are definitely possible,' says Dr Christine Finn from the University of Jena.
Disruptions of salesperson-customer relationships. Is that always bad?
Implications from sales relationship disruptions are intricate and can be revitalizing.
Do open relationships really work?
Open relationships typically describe couples in which the partners have agreed on sexual activity with someone other than their primary romantic partner, while maintaining the couple bond.
The 7 types of sugar daddy relationships
University of Colorado Denver researcher looks inside 48 sugar daddy relationships to better understand the different types of dynamics, break down the typical stereotype(s) and better understand how these relationships work in the United States.
Positive relationships boost self-esteem, and vice versa
Does having close friends boost your self-esteem, or does having high self-esteem influence the quality of your friendships?
Strong family relationships may help with asthma outcomes for children
Positive family relationships might help youth to maintain good asthma management behaviors even in the face of difficult neighborhood conditions, according to a new Northwestern University study.
In romantic relationships, people do indeed have a 'type'
Researchers at the University of Toronto show that people do indeed have a 'type' when it comes to dating, and that despite best intentions to date outside that type -- for example, after a bad relationship -- some will gravitate to similar partners.
Advancing dementia and its effect on care home relationships
New research published today in the journal Dementia by researchers from the University of Chichester focuses on the effects of behavioral change due to dementia in a residential care home setting.
Passion trumps love for sex in relationships
When women distinguish between sex and the relational and emotional aspects of a relationship, this determines how often couples in long-term relationships have sex.
More Relationships News and Relationships Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Clint Smith
The killing of George Floyd by a police officer has sparked massive protests nationwide. This hour, writer and scholar Clint Smith reflects on this moment, through conversation, letters, and poetry.
Now Playing: Science for the People

#562 Superbug to Bedside
By now we're all good and scared about antibiotic resistance, one of the many things coming to get us all. But there's good news, sort of. News antibiotics are coming out! How do they get tested? What does that kind of a trial look like and how does it happen? Host Bethany Brookeshire talks with Matt McCarthy, author of "Superbugs: The Race to Stop an Epidemic", about the ins and outs of testing a new antibiotic in the hospital.
Now Playing: Radiolab

Dispatch 6: Strange Times
Covid has disrupted the most basic routines of our days and nights. But in the middle of a conversation about how to fight the virus, we find a place impervious to the stalled plans and frenetic demands of the outside world. It's a very different kind of front line, where urgent work means moving slow, and time is marked out in tiny pre-planned steps. Then, on a walk through the woods, we consider how the tempo of our lives affects our minds and discover how the beats of biology shape our bodies. This episode was produced with help from Molly Webster and Tracie Hunte. Support Radiolab today at Radiolab.org/donate.