STABILITY ASSESSMENT OF VOLCANIC NATURAL CAVES – LAVA TUNNELS – USING BOTH EMPIRICAL AND NUMERICAL APPROACH, CASE STUDIES OF GALAPAGOS ISLANDS (ECUADOR) AND LANZAROTE ISLAND (CANARY – SPAIN
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STABILITY ASSESSMENT OF VOLCANIC NATURAL CAVES – LAVA TUNNELS – USING BOTH EMPIRICAL AND NUMERICAL APPROACH, CASE STUDIES OF GALAPAGOS ISLANDS (ECUADOR) AND LANZAROTE ISLAND (CANARY – SPAIN