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    Time reverse location of seismic long-period events recorded on Mt Etna
    We present the first application of a time reverse location method in a volcanic setting, for a family of long-period events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From June 18th to July 3rd, 2008, 50 broadband seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of long-period events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two long-period families we first applied the method to two synthetic datasets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.
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