Questo secondo volume prosegue la breve trattazione sulle catastrofi naturali. E la volta delle catastrofi dell acqua e dell aria, spesso sui giornali quando un uragano o un inondazione colpiscono il nostro pianeta. E anche delle minacce cosmiche, rare ma in grado di annientare la nostra civilta.

Vedremo quegli straordinari eventi di cui conosciamo l esistenza dallo studio degli strati geologici e dei fossili, ma la cui causa e ancora avvolta nel mistero. Si tratta delle estinzioni di massa, episodi in cui la biosfera e cambiata in maniera improvvisa e drammatica a causa di una catastrofe globale.

Tra un aneddoto e una digressione sulle basi scientifiche dei fenomeni e passando attraverso qualche caso di studio, si incuriosisce il lettore su un tema importante e coinvolgente.

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This book introduces the reader to the wonders of Mars, covering all aspects from our past perceptions of the planet through to the latest knowledge on its history, its surface processes such as impact cratering, volcano formation, and glaciation, and its atmosphere and climate. In addition, a series of ten intriguing open issues are considered in a more advanced way. These include such thought-provoking questions as What turned off the planet's magnetic field?, Why are the northern and southern hemispheres so different?, What was the fate of the once abundant water?, and Is there, or was there, life on Mars? Numerous original figures, unavailable elsewhere, reproduce details of images from Viking, CTX, MOC, HiRISE, THEMIS, and HRSC. The book will appeal especially to general readers interested in planetary sciences, astronomy, astrogeology, and space exploration and to students of Earth Sciences and Natural and Environmental Sciences. The higher-level material on the remaining mysteries of Mars will also be of interest to astrogeologists and other researchers.

Landslides represent one of the most destructive natural catastrophes. They can reach extremely long distances and velocities, and are capable of wiping out human communities and settlements. Yet landslides have a creative facet as they contribute to the modification of the landscape. They are the consequence of the gravity pull jointly with the tectonic disturbance of our living planet. Landslides are most often studied within a geotechnical and geomorphological perspective. Engineering calculations are traditionally applied to the stability of terrains. In this book, landslides are viewed as a physical phenomenon. A physical understanding of landslides is a basis for modeling and mitigation and for understanding their flow behavior and dynamics. We still know relatively little about many aspects of landslide physics. It is only recently that the field of landslide dynamics is approaching a more mature stage. This is testified by the release of modelling tools for the simulation of landslides and debris flows. In this book the emphasis is placed on the problems at the frontier of landslide research. Each chapter is self-consistent, with questions and arguments introduced from the beginning.

Landslides represent one of the most destructive natural catastrophes. They can reach extremely long distances and velocities, and are capable of wiping out human communities and settlements. Yet landslides have a creative facet as they contribute to the modification of the landscape. They are the consequence of the gravity pull jointly with the tectonic disturbance of our living planet.

Landslides are most often studied within a geotechnical and geomorphological perspective. Engineering calculations are traditionally applied to the stability of terrains. In this book, landslides are viewed as a physical phenomenon. A physical understanding of landslides is a basis for modeling and mitigation and for understanding their flow behavior and dynamics. We still know relatively little about many aspects of landslide physics. It is only recently that the field of landslide dynamics is approaching a more mature stage. This is testified by the release of modelling tools for the simulation of landslides and debris flows. In this book the emphasis is placed on the problems at the frontier of landslide research. Each chapter is self-consistent, with questions and arguments introduced from the beginning.

Le catastrofi sono classificate in base agli elementi della tradizione filosofica ellenica e la loro ragione fisica e alla base dell'intera trattazione. Il libro e diviso in due volumi, indipendenti ma correlati allo stesso tempo. Nel primo, dopo una breve introduzione alle catastrofi naturali, si affrontano le catastrofi della terra e quelle del fuoco: terremoti, frane, eruzioni vulcaniche. Vengono fornite alcune informazioni sull'interno della Terra, necessarie per comprendere l'origine delle catastrofi. L'autore si cimenta in un vero e proprio esperimento letterario, combinando problematiche diverse all'interno della stessa opera. Cosi, per esempio, dopo uno studio sulle cause delle frane, si analizza la visione medioevale delle catastrofi, per poi ritornare agli argomenti principali del libro, il tutto arricchito da numerosi esempi e racconti che rendono la trattazione vivace e coinvolgente."