T HE WORLD’S CLIMATE RARELY SENDS CLEAR SIGNALS. THE INTERACTIONS of hundreds of variables—of sunlight, ocean currents, precipitation, fire, volcanic eruptions, topography, and the respiration of living things—produce a complex system that scientists are just beginning to understand, and that defies precise forecasts. In any given year, some regions are warmer than normal while others are coole...

mount bidkhan stratovolcano is located in the central iranian volcanic belt. it is composed of several types of pyroclastic deposits, lava flows and intrusive bodies. textural and chemical characteristics of plagioclase phenocrysts from the eruptive products volcanic edifice, record complex magma mixing events over the lifetime of the volcano. evidences such as xenocrystic high al+ti clinopyrox...

The Khoy Ophiolitic Complex (KOC) as a part of Tethyan, Izmir-Ankara- Erzincan and Bitlis-Zagros sutures of South East (SE) Turkey is broadly exposed around Khoy region (NW Iran). This complex comprises dismembered fragments of mantle lithosphere, obducted oceanic lithosphere and parts of volcanic arc remnants. The Khoy Ophiolitic Complex can be structurally divided into two major eastern and w...

Introduction: The Amphitrites – Peneus Paterae complex lies on the southern rim of Hellas in Malea Planum [1]. It is a low relief volcanic construct with two large calderas. A volcanic origin was proposed on the basis of Mariner 9 and Viking data [2, 3, 4]. MOLA altimetry and MOC images provide new insight into the volcanic, aeolian and polar processes that have occurred in the region. Fig. 1 i...

Dielectric data in volcanic ash at weather radar wavelengths (centimeter range) are extremely sparse and are crucial for radar sensing of ash clouds and for imaging of volcanic terrains. This study extends previous data to include a wavelength range of 1.5-7.5 cm and volcanic ash compositions of 50-75 % silica. The real part of the complex permittivity, 2′, of volcanic ash is 6± 0.5 (1σ) for al...