Obsidian balls (marekanite) from Cerro Tijerina, central Nicaragua: petrographic investigations

Public health surveillance after a volcanic eruption: lessons from Cerro Negro, Nicaragua, 1992.

The eruption of the Cerro Negro volcano near León, Nicaragua, on 9 April 1992 distributed an estimated 1.7 million tons of ash over a 200 square kilometer area. An assessment was conducted to evaluate the health effects on approximately 300,000 residents, using routine data obtained by the national epidemiologic surveillance system. It was found that rates of visits to health care facilities fo...

The Role of the Petrographic Microscope in Criminal Investigations

Petrographic Analysis of the 6th Millennium B.C. Dalma Ceramics from Northwestern and Central Zagros

Sixth millennium BC Dalma ceramics from the northwestern and central Zagros have previously been described as beingimpossible to distinguish using decorative style analysis in spite of the great distance between the two regions. In thisstudy, petrographic (thin section) analysis and a small-scale electron microprobe project was carried out on the ceramicsof the two regions, as well as a small s...

Numerical investigations on the stability of flame balls

The paper is concerned with the numerical simulation of two– and three–dimensional flame balls. In the two–dimensional case we use a Galerkin–type discretization in an adaptive basis of orthogonal wavelets. Therewith the solution is represented by means of a reduced basis being adapted in each time step. For the three–dimensional simulations we employ a classical Fourier pseudospectral method i...

A reassessment of current volcanic emissions from the Central American arc with specific examples from Nicaragua

The Central American volcanic arc supplies a significant proportion of the persistent annual global sulphur dioxide emissions from volcanoes. In November/December 2003, we completed a survey of the arc section from Mombacho to San Cristóbal in Nicaragua recording individual mean fluxes of 800, 530 and 220 Mg day 1 in the plumes from San Cristóbal, Telica and Masaya, respectively. An assessment ...