Abstract
In this paper we show and discuss the results of gravity and magnetic surveys of Panarea Island and its archipelago. The most recent volcanic manifestation occurred in November 2002 with a shallow submarine gas eruption between the islets of Dattilo, Panarelli, Lisca Bianca, Bottaro and Lisca Nera. Currently, the activity of Panarea is monitored through a multidisciplinary study under the umbrella of the Italian Department of Civil Protection with the goal of defining the hazard of this area. With this aim, in May 2006 the first gravity and magnetic surveys of Panarea Island and its archipelago were performed. The offshore magnetic data were obtained using a marine magnetometer, a Geometrics G880, from the Istituto Idrografico dell Marina (IIM). Onshore and offshore magnetic data were integrated into an unique dataset for complete magnetic coverage of the study area. By using two micro-gravimeters (LaCoste & Romberg), gravity data were collected along tracks every 250 meters. The gravity dataset was processed using the standard method. A Bouguer reduction was applied to the free-air gravity dataset using a detailed digital elevation model of the island and the neighbouring sea after evaluation of the optimal Bouguer density to reduce the topographic effect. The result is a Bouguer anomaly map that shows lateral variations in density distribution and the relationships between the shallow volcanic/crustal features and tectonic lineaments. This evidence is also highlighted by the magnetic pattern, which suggests the importance of the youngest volcanic deposits with respect to the magnetic features of the island.
Highlights
Panarea Island is part of the Aeolian Arc, which consists of seven islands and severalL
We present the results of gravity and magnetic surveys
The potential field data acquired during spring 2006, have yielded a new understanding of Panarea Island
Summary
Panarea Island is part of the Aeolian Arc, which consists of seven islands and several. Pyroclastic deposits of external provenance cover the volcanic products of Panarea and its islets. This unit is dated between 70 and 8 ka (Lucchi et al, 2007), clipping the older deposits and representing the last volcanic/eruptive event in the area. Volcanic activity produces submerged gas exhalation among the islets and several fumaroles located in the Calcara zone, north Panarea Island The magnetic anomaly field of Panarea Island and its archipelago were analyzed to describe the highly magnetized zones and to determine the relationship between the distribution of exhalative centres and magnetization trends. The gravity analysis was limited to Panarea Island with a set of measurements covering the volcanic apparatus. The goal was to provide an interpretation of the Panarea volcanic system based on a new potential field dataset merged to the tectonic and structural features
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