Abstract. A one-dimensional hydrological model of a slope covered with pyroclastic materials is proposed. The soil cover constituted by layers loose volcanic ashes and pumices, total thickness between 1.8 m 2.5 m, lying upon fractured limestone bedrock. mean inclination the around 40°, slightly larger than friction angle ashes. Thus, equilibrium slope, significantly affected cohesive contribution exerted suction in unsaturated conditions, may be altered rainfall infiltration. assumes single...

Many mountainous areas in Campania, southern Italy, are characterized by steep slopes covered unsaturated volcanic deposits. Shallow landslides frequently triggered intense and persistent rainfall events, often turning into debris flows that cause huge damage casualties. Field hydrological monitoring is a useful tool to develop consistent models of slope response rainfall, terms soil suction moisture, define landslide triggering conditions. This one the reasons why since 2002 field being...

Of all landslides, subaerial flowslides are the most dangerous. According to literature, in saturated granular deposits caused by static liquefaction induced loss of stability. However, catastrophic that occurred on steep slopes Campania (southern Italy) 1998, 1999, and 2005 were triggered rainwater infiltration into shallow pyroclastic soils, which initially unsaturated. Starting from experience collected during investigations some these writers consider flowslide evolution as a result...

Abstract The mechanics of rainfall-induced flowslides in pyroclastic soils have yet to be completely clarified. complexity phenomena (rainfall-induced failure initially unsaturated granular deposits, post-failure transition flow-like landslide) requires the use a well-equipped small-scale flume. To this aim, flume experiments at Second University Naples were performed analyze fundamental aspects such phenomena. A new experimental program is now being carried out assess performance time...

An intensive search for amyotrophic lateral sclerosis (ALS) in Mexicans revealed only 16 patients diagnosed between 1962 and 1969 the Instituto de Seguridad y Servicios Sociales los Trabajadores del Estado (ISSSTE) government health program. The prevalence was 0.8 average annual incidence mortality were 0.40 0.28/100,000 population, respectively. These low rates confirm reports of a ALS Mexico among Mexican-Americans United States based on death certificates. Pathologically, neurofibrillary...

Although landsliding is the macroscopic effect of slope failure, it only final stage an often time-consuming process soil deformation. In many cases, movement remains extremely slow and undetected for a long time; in other failure abrupt, preceded by small deformations followed rapid, destructive movements. This case granular soils pyroclastic nature, which involve extensive mountainous area surrounding Mt. Vesuvius southern Italy. Given that around highly urbanized densely populated,...

Abstract Air-fall pyroclastic soil deposits usually display a loose fabric composed of alternating layers ashes and pumices. Such deposits, when lying on steep slopes, represent major geohazard due to the occurrence landslides. This is case carbonate massifs in Campania (southern Italy), wide landslide-prone area approximately 400 km 2 covered with soils. In such cohesionless additional shear strength provided by suction unsaturated conditions important for ensuring slope stability can be...

Landslides are a serious hazard globally and the exposed areas require strong effort for their surveillance protection of populations infrastructures at risk. When volumes involved in complex gravity-driven processes enormous, it would be difficult or impossible to implement active works landslide mitigation. Therefore, better understanding underlying is necessary. A possible way go forward monitoring system an affected area which allows observe accelerations movement order appropriate...

Broad mountainous areas worldwide experience rainfall-induced slope movements, exacerbated by climate changes, causing heavy damages and fatalities. Often in a single geomorphological context, the same rainstorm can trigger many instabilities characterized different degrees of mobility presenting reach angles varying from 10° 50°.This is case wide area around Naples (South Italy) where shallow young pyroclastic granular covers initially unsaturated conditions are frequently...

Many mountainous areas in Campania, Southern Italy, are characterized by steep slopes covered loose unsaturated pyroclastic deposits laying upon fractured limestone bedrock. The soil covers mainly constituted layers of ashes and pumices. Large intense rainfall events trigger shallow landslides, often turning into debris flows that cause huge damage casualties. slope Cervinara, around 40 km Northeast Naples, was involved a catastrophic flowslide on 16 December 1999, triggered rainstorm 325 mm...

We report the experimental application of distributed optical fiber sensors, based on stimulated Brillouin scattering (SBS), to monitoring a small-scale granular slope reconstituted in an instrumented flume and subjected artificial rainfall until failure, volcanic rock slope. The experiments demonstrate sensors' ability reveal sudden increase soil strain that foreruns failure debris flow phenomenon, as well monitor fractures tuff rocks. This study offers important perspective use sensors...

Air-fall pyroclastic deposits on steep slopes in Campania (Southern Italy) are periodically subjected to rainfall-induced landslides that may evolve into catastrophic flowslides. To protect built-up areas, early warning systems (EWSs) have been implemented which essentially based pluviometric thresholds or models unable accurately monitor the physical phenomena responsible for flowslide generation deposits. Over last 20 years, with no evolution flows occurred this area and alarms generated...