15 16 The degassing of magmatic volatiles during eruptions beneath ice sheets and glaciers, 17 as recorded by the dissolved volatile content quenched in volcanic rocks, could 18 provide powerful new constraints on former ice thicknesses in volcanic areas. As 19 volcanic rocks are readily dateable using radiometric methods, subglacial volcanoes 20 may therefore provide crucial information on the...

By analyzing the type and content of gas in oil, latent faults equipment can be found as soon possible, monitored at any time. In this paper, a degassing device based on headspace method is designed. The oil circuit adopts way pump battery valve to complete inlet discharge. Through stirring, dissolved reach dynamic balance gas-liquid two-phase, so realize rapid effective separation oil. At same...

We highlight a potentially important trigger for bubble growth and degassing in volcanic bombs. We have successfully triggered bubble growth in previously unvesiculated samples of silicate melt during experiments to simulate volcanic bomb impact, by firing pellets at, and dropping weights onto, melt samples. We call suggest the term ‘impact vesiculation’ to denote this phenomenon, in the labora...

he undergrounding of energy transmission cables is widely recognized as a good means to provide reliable supplies of power at a low total cost [1], [2]. As utilities increasingly acknowledge this and install many more high voltage (HV) and extra high voltage (EHV) cables, they will face a major challenge: namely, sourcing the increased amount of high quality power cable with the cable manufactu...

Eruptive activity at Turrialba Volcano (Costa Rica) has escalated significantly since 2014, causing airport and school closures in the capital city of San José. Whether or not new magma is involved in the current unrest seems probable but remains a matter of debate as ash deposits are dominated by hydrothermal material. Here we use high-frequency gas monitoring to track the behavior of the volc...

In order to assess the effect of eruption rate on the surface morphology and degassing mechanisms of silicic lava flows, we studied surface characteristics and obtained water content and hydrogen isotopic values of samples from flows at the Mount St. Helens and Santiaguito lava domes. We compared the surface textures and inferred degassing processes to short-term extrusion rates and found that ...

A series of 88 Vulcanian explosions occurred at the Soufrière Hills volcano, Montserrat, between August and October, 1997. Conduit conditions conducive to creating these and other Vulcanian explosions were explored via analysis of eruptive products and one-dimensional numerical modeling of magma ascent through a cylindrical conduit. The number densities and textures of plagioclase microlites we...

Question: After mixing my mobile phase and using it over the course of several weeks, the retention times of my compounds gradually increase, ending up approximately 20–30% longer. Upon preparing a new mobile phase, the retention times almost immediately return to where they originally were. Then, the situation occurs again over the lifetime of the new mobile phase. This cannot be a pump proble...