Hydrothermal alteration can result in pore pressurization and volcano instability
نویسندگان
چکیده
Abstract The collapse of a volcanic flank can be destructive and deadly. Hydrothermal alteration is common to volcanoes worldwide thought promote volcano instability by decreasing rock strength. However, some laboratory studies have shown that not all reduces Our new data for altered rhyodacites from Chaos Crags (Lassen center, California, USA) show pore- crack-filling mineral precipitation reduce porosity permeability increase strength, Young's modulus, cohesion. A significant reduction in permeability, as much four orders magnitude, will inhibit fluid circulation create zones high pore pressure. We explored the consequences pressurization on stability using large-scale numerical modeling. Upscaled physical mechanical properties hydrothermally rocks were used input parameters our Results high-pore-pressure zone within increases deformation increasing size this observed deformation. associated with precipitation, therefore deformation, likelihood spreading, collapses, phreatic/phreatomagmatic explosions. conclude porosity-decreasing alteration, here, porosity-increasing both collapse, but different mechanisms. should monitored at incorporated into hazard assessments.
منابع مشابه
Volcano collapse promoted by hydrothermal alteration and edifice shape, Mount Rainier, Washington
Figure 1. Extent of widespread Osceola Mudflow and Electron mudflow deposits from Mount Rainier. These deposits contain hydrothermally derived clay minerals and likely originated from flank collapses. Modified from Scott and Vallance (1995) and Vallance and Scott (1997). ABSTRACT Catastrophic collapses of steep volcano flanks threaten many populated regions, and understanding factors that promo...
متن کاملVolcano Instability and Lateral Collapse
Active volcanoes are dynamically evolving structures, the life-cycles of which are punctuated by episodes of flank instability and lateral failure. Such behaviour is now recognised as ubiquitous and lateral collapses are estimated to have occurred at least four times a century over the past 500 years. In the Andes, three quarters of the large volcanic edifices have experienced collapse, while o...
متن کاملassessing political stability and instability in central asia and caucasus; case study, azerbaijan and kyrgyzstan
منطقه ی آسیای مرکزی وقفقاز به عنوان منطقه ای تاریخی و به دلیل دارا بودن ذخایر عظیم هیدرو کربنی از اهمیت ویژه ای برخوردار است. کشورهای این منطقه از عوامل عمده ی بی ثباتی نظیر عوامل جغرافیایی، اقتصادی، امنیتی، اجتماعی و سیاسی رنج می برند. پس از فروپاشی اتحاد جماهیر شوروی کشورهای منطقه از نعمت استقلال ناخواسته ای برخوردار شدند که مشکلات فوق را برای آن ها چندین برابر می کرد. در این روند برخی از این...
15 صفحه اولOptimization of a pressurization methodology for extracting pore-water.
Sediment toxicity can be assessed by conducting pore-water toxicity assays with standard water column organisms. Several methods have been developed for sampling pore-water. Centrifugation and pressurization methods are recommended when large volumes of pore-water are required to perform toxicity assays. Nevertheless, these methods involve sediment transportation and storage in laboratory, whic...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Geology
سال: 2021
ISSN: ['0091-7613', '1943-2682']
DOI: https://doi.org/10.1130/g49063.1