Identifying Probable Submarine Hydrothermal Spots in North Santorini Caldera Using the Generalized Moments Method

Author:

Dura Ana1,Nomikou Paraskevi1ORCID,Mertzimekis Theo J.2ORCID,Hannington Mark D.3,Petersen Sven3,Poulos Serafim1

Affiliation:

1. Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Zografou Campus, GR-15784 Athens, Greece

2. Department of Physics, National and Kapodistrian University of Athens, Zografou Campus, GR-15784 Athens, Greece

3. GEOMAR—Helmholtz 7 Center for Ocean Research Kiel, D-24148 Kiel, Germany

Abstract

The presence of active hydrothermal vent fields near residential areas and their possible link to volcanic activity poses a potential hazard to the environment, society, and the economy. By capitalizing on Autonomous Underwater Vehicle sampling methodologies and applying the Generalized Moments Method model for geological and physical processes in these environments, we shed light on the underlying dynamics shaping the physicochemical characteristics of the vents. In this study, we focus on the Northern Caldera of Santorini and, more specifically, on the recorded CTD data (Conductivity, Temperature, Depth). The data sets were collected in 2017 in Santorini using an Autonomous Underwater Vehicle during the GEOMAR POS510 mission. Our research shows that the active vent field within the caldera probably follows a multifractal behavior and exhibits a weak memory effect. Depth Profiles and Time Series show similar behavior among conductivity and temperature. The variance and moments of both parameters underline the existence of two different mechanisms governing the behavior of the vent field. Finally, the structure function shows that changes in the time series are described by a Cauchy–Lorentz distribution.

Funder

Greece and the European Union (European Social Fund-ESF) through the Operational Programme

Hellenic Foundation for Research and Innovation

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences

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