Abstract Tephra from large explosive eruptions can cause damage to buildings over wide geographical areas, creating a variety of issues for post-eruption recovery. This means that evaluating the extent and nature likely building future is an important aspect volcanic risk assessment. However, our ability make accurate assessments currently limited by poor characterisation how perform under varying tephra loads. study presents method remotely assess increase quantity data available developing...

The VEI 7 (220–250 km3), a 52 ka eruption of the Maninjau caldera in Indonesia produced two distinct types white pumices: transparent (TWP) and non-transparent (NTWP). These pumices were identified on outcrops, based their qualitative traits, without use laboratory analyses (geochemical textural). TWPs are typically fragile, irregular shape, have glass vesicle walls around visible large vesicles, whereas NTWPs relatively strong, blocky due to invisible small vesicles. Based chemical...

The flank collapse of Anak Krakatau on 22 December 2018 caused massive topography losses that generated a devastating tsunami in Sunda Strait, which then followed by eruptions progressively changed the and structure Krakatau. Here, we investigated structural changes due to following using high resolution Digital Elevation Model (DEM) before after events sentinel 1A satellite image post-flank collapsed. Results show volumetric collapsed is ~127 x 106 m3, while ~0,8 m3 losses. Structural...

Raung volcano, located within the Ijen UNESCO Global Geopark in East Java, poses a significant risk of volcanic hazard for nearby residents and visitors. Our study provides framework to understand long-term behavior potential hazards by examining its stratigraphy, petrology, temporal magma evolution. The erupted products vary from lava flow, pyroclastic density current (ignimbrite block ash flow), scoria fall, pumice fall. Radiocarbon dating charcoal samples deposits weathered sediments...

Abstract Volcanic rocks of the Java sector Sunda arc have a wide range isotopic compositions that indicate significant addition subjected sediment. What processes control these geochemical characteristics is topic long-standing debate. Here we report Sr–Nd–Pb radiogenic isotope ratios and data from stratigraphically well-constrained Sundoro volcano in central represent volcano’s activity since 34 ka. The basalt (51 wt % SiO2) to andesite (63 are dominated by basaltic andesite. We divide them...

Monogenetic volcanic fields (MVFs) are commonly associated with long-lived polygenetic composite volcanoes in many tectonic settings. The association between and monogenetic has raised questions as to the source of melts feeding – specifically, whether they derived from transcrustal mush underlying a nearby volcano, or batch parental magma different mantle source. To address this question, we studied well-constrained suite scoria samples Gunung Slamet Central Java, Indonesia, its most distal...

Merapi eruption in 2010 produced 17 km high column of ash and southward pyroclastic density current (PDC). Based on the deposits characteristics distributions, PDC is divided into channel overbank facies (pyroclastic flow), associated diluted surge). The hot PDCs dilute-detached are main cause casualty (367 fatalities) medial-distal area (5–16 km), especially near valley Kali Gendol. We reported emplacement temperature these two using reflectance analysis charcoal. used both entombed...

Abstract We reported magma evolution of Slamet volcano, both temporally and spatially, as represented by its lava characteristics. located in Central Java Indonesia, is a Quaternary basaltic stratovolcano part the extensive Sunda volcanic arc. volcanism stage can be divided into Old Young Slamet. characterized to andesite (SiO 2 49-59%), composition have rough morphology western flank. Meanwhile, has more mafic composition, 48-52%), smoother eastern Variation major, minor, trace element...

Abstract Chili is an inflation-forming commodity (volatile food). Prediction of chili price time series data using the ARIMA model approach has good performance for predicting prices in future. The second highest average per capita consumption a month Bengkulu Province, below West Sumatra Province. This shows that level and demand relatively high High impact on volatility chili. analysis illustrates standard deviation or diversity fluctuate over certain period. Based description above, it...

Abstract Pumiceous tephra-fall deposits observed mainly in the western flank of Mt. Raung are indicating past explosive eruption event. The volume and column height eruptive event is estimated using isopach isopleth maps. These maps constructed from seven observation points. pumiceous can be divided into 9 layers bottom to top, White Pumice Fall 1–7, Yellow Fall, Lithic-Rich Scoria Fall. not separated by any soil or weathered layer indicates no significant time gap between them. Isopach...

Scoria cones commonly occur in the lower flank of stratovolcano close to populated area. This spatial relationship increases hazardous risk direct impact volcanic activities people. Therefore, it is necessary gain more understanding formation scoria cone better assess hazards. We studied Mount Loyang, furthest Slamet volcano, approximately 14 km from recent active crater. Quarrying this enables us observe interior structure towards surface as represented by its rocks sequence. The sequences...

We reported detailed investigation of the pumiceous deposits reside in western part Slamet Volcano that are found as both primary and secondary product. Pyroclastic fall, flow surge represent those products, whereas lahar fluvial products. The tephra fall separated by pyroclastic typical sub-plinian to plinian eruption type. occurred between indicating repose time explosive events, youngest concluding these events. Petrographic observation show pumice deposit is extremely vesicular with...

DOI:10.17014/ijog.9.1.131-145Lasem and Senjong Volcanic Complex (LSVC) is one of four Quaternary volcanic complexes with high-K magmatism distributed in the northern coast Central Java. This research aims to understand magmatic evolution complex. Morphostratigraphy analysis field observation show twelve pyroclastic density flow units Lasem Volcano, mainly eastern flanks, but minor occurrences southern western flanks. Meanwhile, nine lava are concentrated on south flank volcano. stratovolcano...

Abstract Debris avalanche deposit is formed by the failure of volcanic edifice and has a high potential to directly impact human civilization. The famous characteristic landform debris hummocky hills. To understand dynamics flow, we investigate morphometric characters hummocks from Gunung Gadung in Raung Volcanic Complex. collapse follows two main flow direction with different kinds avalanche, i.e., freely spreading valley filling. Our study recorded that there no significant correlation...

The study of magma plumbing system underneath a volcano is important to understand eruption triggers, estimate the probability another eruption, and predict future eruptive behavior. Raung Volcano, located in East Java, Indonesia, very active with long-established basaltic dacitic system. most recent activity 2022 was dominated by andesitic Strombolian explosions. However, several Plinian eruptions VEI-4 VEI-5 scale had been documented both andesite dacite composition. Despite its variety...

Abstract Sundoro volcano is an active Quaternary stratovolcano in Central Java, located approximately 50 km west of the Merapi volcano. It attributed to parasitic cones producing basaltic lava flow. We present our findings sedimentary and igneous xenoliths embedded Kekep cone. Xenolith one key materials help identify various lithologies composing substratum a Twelve thin sections were analysed through detailed petrographic observation. identified variations xenolith lithology consisting...