Low-magnitude seismic events (0 ≤ Mw ≤ 3.8) recorded in southern Norway during the period 2000-2019 were used to calculate the sudden co-seismic temperature increases using a simple stress-drop model. The maximum temperature increase associated with an Mw = 3.5 earthquake was ~122°C. Simultaneously, we added 13 historical earthquakes to our study data, which occurred between 1657 and 1989. Here, the maximum temperature rise was ~560°C for an Mw = 5.6 event. The temperature values were analysed to derive local thermo-mechanical effects, such as thermal fracturing, frictional drop and the possible formation of cataclasites and pseudotachylites. Using the Kanamori's equations, we estimated the thermal energy released by individual events and in 2D and 3D cumulative patterns. To identify possible correlations between frictional energy, seismicity distribution and regional geology, the results were spatially correlated with a lineament zone located along the southwestern coastline and a heat flux map.Areas with high thermal energy values seem to be spatially linked with zones that exhibit a high density of lineaments and high heat flux located along the whole of the southwestern Norwegian coast.
<p>Tacora Volcano (17&#186;43&#8217;S &#8211; 69&#186;46&#8217;W) is a composite stratovolcano that lies at the southernmost end of a 10 km-long volcanic lineament that extends between Chile and Per&#250;. Around Tacora volcano, current thermal manifestations are two active fumarolic fields located at the western flank of the stratovolcano and at the volcano summit, indicating active magma degassing in a shallow hydrothermal system. Beneath Tacora volcano is located the NW Challaviento reverse fault that belongs to the Incapuquio - Challaviento fault system of Middle Eocene age. To complement previous exploration results and conceptual modeling developed by INFINERGEO SPA, seventeen short period seismic stations were installed around Tacora volcano, between August and December 2014. Using the P and S wave arrival times of locally recorded seismicity, a 3D velocity model was determined through a travel time tomography. According with the results, we interpreted high Vp /Vs values as water-saturated areas, corresponding to the recharge zone of Tacora hydrothermal system. In addition, low values of &#916;Vp/Vp (%) and Vp/Vs ratio represent the location of a gas-saturated magmatic reservoir between sea level and 2 km depth and circulation networks of magmatic-hydrothermal fluids. Low Vp/Vs volumes (magma reservoir / high temperature hydrothermal fluids), the presence of fumarolic fields and surface hydrothermal alteration have a spatial correlation. The above suggests a structural control of the Challaviento fault in the hydrothermal flow as well as a primary influence in the emplacement and location of the magmatic-hydrothermal reservoir. Finally, we present a cluster analysis using the &#916;Vp/Vp (%) parameter. Through this analysis, we found a method for the identification of a key structure in depth composed by the magma reservoir (low Vp/Vs ratios, low &#916;Vp/Vp (%)), clay level areas (intermediate values of &#916;Vp/Vp (%)), and degasification zones (low values of &#916;Vp/Vp (%)) directly related with the surface thermal manifestations.</p>
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