Science Daily August 11, 2021
Gas storage oil field operations worldwide are typically not stimulating substantial seismicity. However, the Castor sequence in Spain remains to date the most significant case of seismicity related to this type of industrial operations in Europe. The new analysis by an international team of researchers (Germany, Spain, Italy, Switzerland, USA- Stanford University) identified about 3,500 earthquakes, which took place at shallow depth between September and early October in the vicinity of the Castor injection platform using
a combination of advanced seismological techniques applied to an enhanced waveform dataset to better understand the seismogenic process and the geometry of activated fault. They showed that the sequence occurred by progressive fault failure and unlocking, with seismicity initially migrating away from the injection points, triggered by pore pressure diffusion, and then back again, breaking larger asperities loaded to higher stress and producing the largest earthquakes…read more. Open Access TECHNICAL ARTICLE
Locations based on waveform correlations and tS-tP method. Credit: Nature Communications volume 12, Article number: 4783 (2021)