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THE 2021 CUMBRE VIEJA ERUPTION IS HAVING A DEVASTATING SOCIAL AND ECONOMIC IMPACT ON LA PALMA. IT IS ALREADY THE LARGEST HISTORICAL ERUPTION IN TERMS OF LAVA FLOWS AND TEPHRA VOLUME, AND THE MOST DESTRUCTIVE ERUPTION IN EUROPE IN...
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Descripción del proyecto
THE 2021 CUMBRE VIEJA ERUPTION IS HAVING A DEVASTATING SOCIAL AND ECONOMIC IMPACT ON LA PALMA. IT IS ALREADY THE LARGEST HISTORICAL ERUPTION IN TERMS OF LAVA FLOWS AND TEPHRA VOLUME, AND THE MOST DESTRUCTIVE ERUPTION IN EUROPE IN THE LAST 75 YEARS. THE ERUPTION WAS PRECEDED BY SWARMS OF EARTHQUAKES, AND IS ACCOMPANIED BY A HIGH LEVEL OF SEISMICITY, INCLUDING VOLCANO-TECTONIC EARTHQUAKES AT DIFFERENT DEPTHS, AND A LARGE-AMPLITUDE, BUT HIGHLY VARIABLE VOLCANIC TREMOR. IN THIS PROJECT WE PROPOSE TO APPLY STATE-OF-THE-ART SEISMOLOGICAL METHODS TO INVESTIGATE THE MAGMATIC PLUMBING SYSTEM FEEDING THE ERUPTION. WE WILL FOCUS ON THREE MAJOR OBJECTIVES: (1) UNDERSTAND THE CRUSTAL-UPPER MANTLE STRUCTURE AND THE TECTONIC REGIME IN LA PALMA; (2) IMAGE THE MAGMATIC PLUMBING SYSTEM OF CUMBRE VIEJA VOLCANO; AND (3) ASSESS THE ACTIVE MAGMA PATHWAYS DURING THE 2021 ERUPTION. WE WILL RELY ON TWO UNIQUE SEISMIC DATASETS. THE FIRST ONE IS THE ERUPTION DATASET RECORDED BY THE IGN AND INVOLCAN SEISMIC NETWORKS, INCLUDING TWO SEISMIC ARRAYS DEPLOYED BY UGR. SINCE SEVERAL ANALYSES ARE BEING CURRENTLY PERFORMED IN THE FRAMEWORK OF PEVOLCA, OUR EFFORTS WILL BE FOCUSED ON NON-CONVENTIONAL APPROACHES THAT MIGHT COMPLEMENT THESE RESULTS. FOR EXAMPLE, WE WILL APPLY TEMPLATE MATCHING AND MACHINE LEARNING TOOLS TO SEEK FOR MICROEARTHQUAKES (M<2.5) BURIED IN THE VOLCANIC TREMOR SIGNAL, AND ESTIMATE SOURCE LOCATIONS AND MECHANISMS OF THESE SMALL EVENTS. IN A SECOND STEP, WE WILL USE THE EARTHQUAKE DATA TO OBTAIN 3D AND 4D IMAGES OF THE MAGMA PLUMBING SYSTEM USING ANISOTROPIC VELOCITY TOMOGRAPHY, ATTENUATION TOMOGRAPHY, AND SCATTERING TOMOGRAPHY. FINALLY, WE WILL PERFORM ARRAY- AND NETWORK-BASED ANALYSES OF THE STRONG VOLCANIC TREMOR THAT ACCOMPANIES THE ERUPTION TO IMAGE THE ACTIVE SECTIONS OF THE SHALLOW VOLCANIC CONDUITS. THE SECOND DATASET WILL BE GENERATED DURING THE PROJECT. IN THE SUMMER OF 2023 WE WILL DEPLOY A VERY DENSE BROADBAND SEISMIC NETWORK IN THE ISLAND OF LA PALMA FOR PASSIVE RECORDING OF SEISMICITY AND NOISE. 35 BROADBAND STATIONS WILL BE DEPLOYED FOR ABOUT A YEAR, WHICH COMBINED WITH THE IGN AND INVOLCAN STATIONS, CONFIGURES A NETWORK WITH AVERAGE INTER-STATION SPACING AROUND 5 KM. WITH THESE DATA, WE WILL APPLY AMBIENT NOISE TOMOGRAPHY TO DETERMINE THE S-WAVE VELOCITY STRUCTURE, AND RECEIVER FUNCTION ANALYSES TO MAP THE DISCONTINUITIES IN THE CRUST AND UPPER MANTLE. ADDITIONALLY, IN THE SPRING OF 2024 WE WILL DEPLOY LARGE-N ARRAYS USING ~230 SHORT-PERIOD GEOPHONES, INTERTWINED WITH BROADBAND STATIONS, IN TWO CONFIGURATIONS (LINEAR PROFILES AND 2D GRIDS) WITH INTER-STATION SPACING OF 0.5 KM. THE HIGH DENSITY OF STATIONS WILL ALLOW US TO OBTAIN HIGH-RESOLUTION IMAGES OF THE CRUSTAL STRUCTURE AND THE MAGMA PLUMBING SYSTEM UNDER CUMBRE VIEJA VOLCANO. OLCANO SEISMOLOGY\LA PALMA\CUMBRE VIEJA VOLCANO\MAGMA PLUMBING SYSTEM\LARGE-N ARRAYS\RECEIVER FUNCTIONS\SEISMIC TOMOGRAPHY\SEISMIC ARRAYS\VOLCANIC TREMOR\VOLCANIC EARTHQUAKES
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