scholarly journals Comparative interevent time statistics of degassing and seismic activity at Villarrica Volcano (Chile)

2020 ◽  
Author(s):  
Johanna Lehr ◽  
Stefan Bredemeyer ◽  
Wolfgang Rabbel ◽  
Martin Thorwart ◽  
Luis Franco
Keyword(s):  
Seismic Activity ◽  
Interevent Time ◽  
Villarrica Volcano

Characteristics of seismic activity of Villarrica Volcano

2020 ◽  
Author(s):  
Johanna Lehr ◽  
Wolfgang Rabbel
Keyword(s):  
Seismic Activity ◽  
Lava Lake ◽  
Spectral Characteristics ◽  
Signal Separation ◽  
Blind Signal Separation ◽  
Blind Signal ◽  
Tectonic Earthquakes ◽  
Villarrica Volcano ◽  
Injection Methods ◽  
Transient Events

<p>Villarrica is one of the most active and <span>dangerous</span> volcanoes in Chile. During the last decade it consisted of a single open vent hosting an active lava lake which produced mild stombolian explosions, persistent tremor and continuous degassing.</p><p>We present an analysis of the seismic activity of Villarrica between 2010 and 2012. Periods of increased lava lake activity are characterized by numerous small transient events which exibit a variety of waveforms and spectral characteristics. Statistical analysis of interevent times revealed a periodic occurrence. At comparable volcanic systems (Stromboli, Erebus), such distributions of events indicated unusual periods of activity corresponding to magma injection. Methods of blind signal separation (ICA, PCA) were used to analyse the wavefield. While regional and local tectonic earthquakes can easily be separated, the tremor and transient events from the crater can not.</p>

scholarly journals Multifractal Characterization of Seismic Activity in the Provinces of Esmeraldas and Manabí, Ecuador

Proceedings ◽  
2019 ◽  
Vol 24 (1) ◽  
pp. 27 ◽  
Author(s):  
David I. Cuenca ◽  
Javier Estévez ◽  
Amanda P. García-Marín
Keyword(s):  
Time Series ◽  
Seismic Activity ◽  
Research Work ◽  
Fluctuation Analysis ◽  
Multifractal Detrended Fluctuation Analysis ◽  
Interevent Time ◽  
Large Fluctuations ◽  
Multifractal Behavior ◽  
The Right

Due to the enormous impact of seismic activity and the need to deepen knowledge of its behavior, this research work carries out an analysis of the multifractal nature of the magnitude, inter-distance and interevent time series of earthquakes that occurred in Ecuador during the years 2011–2017 in the provinces of Manabí and Esmeraldas, two areas with high seismic activity. For this study we use multifractal detrended fluctuation analysis (MF-DFA), which allows the detection of multifractality in a non-stationary series as well as in a series of parameters of non-linear characterization. The obtained results revealed that an interevent time series presents a higher degree of multifractality than the two previously mentioned. In addition, the Hurst exponent values were in a non-proportional function to (q), which is a weight value indicating the multifractal behavior of the dynamics of the earthquakes analyzed in this work. Finally, several multifractal parameters were calculated, and as a result all series were skewed to the right. This reveals that small variations in the analyzed series were more dominant than large fluctuations.

A dynamical analysis of the seismic activity of Villarrica volcano (Chile) during September–October 2000

2008 ◽  
Vol 37 (5) ◽  
pp. 1292-1299 ◽  
Author(s):  
Marta Tárraga ◽  
Roberto Carniel ◽  
Ramon Ortiz ◽  
Alicia García ◽  
Hugo Moreno
Keyword(s):  
Seismic Activity ◽  
Dynamical Analysis ◽  
Villarrica Volcano

Shale, Quakes, and High Stakes: Regulating Fracking-Induced Seismicity in Oklahoma, USA and Lancashire, UK

2019 ◽  
Vol 3 (1) ◽  
pp. 1-14
Author(s):  
Miriam R. Aczel ◽  
Karen E. Makuch
Keyword(s):  
United States ◽  
Hydraulic Fracturing ◽  
Shale Gas ◽  
Seismic Activity ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
High Volume ◽  
The United States ◽  
Horizontal Drilling ◽  
Induced Seismic Activity

High-volume hydraulic fracturing combined with horizontal drilling has “revolutionized” the United States’ oil and gas industry by allowing extraction of previously inaccessible oil and gas trapped in shale rock [1]. Although the United States has extracted shale gas in different states for several decades, the United Kingdom is in the early stages of developing its domestic shale gas resources, in the hopes of replicating the United States’ commercial success with the technologies [2, 3]. However, the extraction of shale gas using hydraulic fracturing and horizontal drilling poses potential risks to the environment and natural resources, human health, and communities and local livelihoods. Risks include contamination of water resources, air pollution, and induced seismic activity near shale gas operation sites. This paper examines the regulation of potential induced seismic activity in Oklahoma, USA, and Lancashire, UK, and concludes with recommendations for strengthening these protections.

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