Earthquake-enhanced permeability – evidence from carbon dioxide release following the ML3.5 earthquake in West Bohemia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F17%3A00479549" target="_blank" >RIV/67985530:_____/17:00479549 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/17:10363701 RIV/00216208:11320/17:10363701

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.epsl.2016.12.001" target="_blank" >http://dx.doi.org/10.1016/j.epsl.2016.12.001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.epsl.2016.12.001" target="_blank" >10.1016/j.epsl.2016.12.001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Earthquake-enhanced permeability – evidence from carbon dioxide release following the ML3.5 earthquake in West Bohemia

Popis výsledku v původním jazyce

The West Bohemia/Vogtland region is characterized by earthquake swarm activity and degassing of CO2 of mantle origin. A fast increase of CO2 flow rate was observed 4 days after a M-L 3.5 earthquake in May 2014 in the Hartousov mofette, 9 km from the epicentres. During the subsequent 150 days the flow reached sixfold of the original level, and has been slowly decaying until present. Similar behavior was observed during and after the swarm in 2008 pointing to a fault-valve mechanism in long-term. Here, we present the results of simulation of gas flow in a two dimensional model of Earth's crust composed of a sealing layer at the hypocentre depth which is penetrated by the earthquake fault and releases fluid from a relatively low-permeability lower crust. This simple model is capable of explaining the observations, including the short travel time of the flow pulse from 8 km depth to the surface, long-term flow increase and its subsequent slow decay. Our model is consistent with other analyse of the 2014 aftershocks which attributes their anomalous character to exponentially decreasing external fluid force. Our observations and model hence track the fluid pressure pulse from depth where it was responsible for aftershocks triggering to the surface where a significant long-term increase of CO2 flow started 4 days later.

Název v anglickém jazyce

Earthquake-enhanced permeability – evidence from carbon dioxide release following the ML3.5 earthquake in West Bohemia

Popis výsledku anglicky

The West Bohemia/Vogtland region is characterized by earthquake swarm activity and degassing of CO2 of mantle origin. A fast increase of CO2 flow rate was observed 4 days after a M-L 3.5 earthquake in May 2014 in the Hartousov mofette, 9 km from the epicentres. During the subsequent 150 days the flow reached sixfold of the original level, and has been slowly decaying until present. Similar behavior was observed during and after the swarm in 2008 pointing to a fault-valve mechanism in long-term. Here, we present the results of simulation of gas flow in a two dimensional model of Earth's crust composed of a sealing layer at the hypocentre depth which is penetrated by the earthquake fault and releases fluid from a relatively low-permeability lower crust. This simple model is capable of explaining the observations, including the short travel time of the flow pulse from 8 km depth to the surface, long-term flow increase and its subsequent slow decay. Our model is consistent with other analyse of the 2014 aftershocks which attributes their anomalous character to exponentially decreasing external fluid force. Our observations and model hence track the fluid pressure pulse from depth where it was responsible for aftershocks triggering to the surface where a significant long-term increase of CO2 flow started 4 days later.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Earth and Planetary Science Letters

ISSN

0012-821X

e-ISSN

—

Svazek periodika

460

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

60-67

Kód UT WoS článku

000393008500007

EID výsledku v databázi Scopus

2-s2.0-85006921244