scholarly journals Total mass estimate of the January 23, 2018, phreatic eruption of Kusatsu-Shirane Volcano, central Japan

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Nobuko Kametani ◽  
Yasuo Ishizaki ◽  
Mitsuhiro Yoshimoto ◽  
Fukashi Maeno ◽  
Akihiko Terada ◽  
...  
Keyword(s):  
Total Mass ◽  
Integration Method ◽  
Phreatic Eruption ◽  
Fall Deposit ◽  
Central Japan ◽  
Fitting Method ◽  
Mass Estimate ◽  
Pyroclastic Cone ◽  
Main Crater ◽  
Eruption Plume

AbstractOn January 23, 2018, a small phreatic eruption (VEI = 1) occurred at the Motoshirane Pyroclastic Cone Group in the southern part of Kusatsu-Shirane Volcano in central Japan. The eruption ejected ash, lapillus, and volcanic blocks from three newly opened craters: the main crater (MC), west crater (WC), and south crater (SC). Volcanic blocks were deposited up to 0.5 km from each crater. In contrast, the ash released during this eruption fell up to 25 km ENE of the volcano. The total mass of the fall deposit generated by the eruption was estimated using two methods, yielding total masses of 3.4 × 104 t (segment integration method) and 2.4 × 104 t (Weibull fitting method). The calculations indicate that approximately 70% of the fall deposit was located within 0.5 km of the craters, which was mainly attributed to the low height of the eruption plume.

X‐Ray Total Mass Estimate for the Nearby Relaxed Cluster A3571

2000 ◽  
Vol 536 (1) ◽  
pp. 73-78 ◽  
Author(s):  
J. Nevalainen ◽  
M. Markevitch ◽  
W. Forman
Keyword(s):  
Total Mass ◽  
X Ray ◽  
Mass Estimate

scholarly journals Petrological characteristics of Shirane Pyroclastic Cone Group, Yumi-ike Maar and Ainomine Pyroclastic Cone at Kusatsu-Shirane Volcano, central Japan

2020 ◽  
Vol 126 (3) ◽  
pp. 157-165
Author(s):  
Nobuko Kametani ◽  
Yasuo Ishizaki ◽  
Nanako Katsuoka ◽  
Mitsuhiro Yoshimoto ◽  
Akihiko Terada
Keyword(s):  
Central Japan ◽  
Pyroclastic Cone

Dwarfs in the entourage of the Local Volume groups: flow tracers and cosmological probes

2018 ◽  
Vol 14 (S344) ◽  
pp. 488-490
Author(s):  
Olga Kashibadze ◽  
Igor Karachentsev ◽  
Valentina Karachentseva
Keyword(s):  
Total Mass ◽  
Dwarf Galaxies ◽  
Model Parameters ◽  
Cosmic Expansion ◽  
Local Volume ◽  
Velocity Surface ◽  
Optimal Value ◽  
Virial Mass ◽  
Mass Estimate ◽  
Zero Velocity Surface

AbstractWe consider a sample of dwarf galaxies with accurate distances and velocities around 14 massive groups in the Local Volume. We combine all the data into a single synthetic group, and then determine its radius of the zero-velocity surface, separating it against the global cosmic expansion. Our estimation is derived from fitting the the spherical infall model (including effects of the cosmological constant) to the observational data.We found the optimal value of the radius to be 0.93 ± 0.02 Mpc. Assuming the Planck model parameters, it corresponds to the total mass of the synthetic group (1.6 ± 0.2) × 1012M⊙. Thus, we obtain the paradoxical result that the total mass of the synthetic group estimated on the scale of 3–4 its virial radius is only 60% of the virial mass estimate. Anyway, we conclude that wide outskirts of the nearby groups do not contain a large amount of hidden mass outside their virial radii.

ESTIMATING ORE MASSES IN GRAVITY PROSPECTING

Geophysics ◽  
1945 ◽  
Vol 10 (1) ◽  
pp. 50-62 ◽  
Author(s):  
Sigmund Hammer
Keyword(s):  
Potential Theory ◽  
Mass Distribution ◽  
Total Mass ◽  
Gravity Data ◽  
Point Of View ◽  
Theoretical Point ◽  
Chromite Ore ◽  
Ore Body ◽  
Gauss Theorem ◽  
Mass Estimate

The interpretation of the results of gravitational prospecting surveys is considered, from a theoretical point of view, in terms of the magnitude of the causative mass as distinct from the conventional interpretation in terms of the mass distribution (size, shape and depth). A general proof is given, based on Gauss’ Theorem in potential theory, that the former problem is unique and the uniqueness is illustrated by an analytical example which also serves to demonstrate the well‐known lack of uniqueness of the latter problem. Practical formulae are presented for estimating the total mass directly from the gravity data and the precision of the mass estimate is considered. The method is applied to a practical gravimeter survey over a known chromite ore body and the estimated mass is found to be in excellent agreement with estimates from core drilling.

scholarly journals Estimation of total discharged mass from the phreatic eruption of Ontake Volcano, central Japan, on September 27, 2014

2016 ◽  
Vol 68 (1) ◽  
Author(s):  
Shinji Takarada ◽  
Teruki Oikawa ◽  
Ryuta Furukawa ◽  
Hideo Hoshizumi ◽  
Jun’ichi Itoh ◽  
...  
Keyword(s):  
Phreatic Eruption ◽  
Central Japan ◽  
Ontake Volcano

scholarly journals Geology and eruption history of the Motoshirane Pyroclastic Cone Group, Kusatsu-Shirane Volcano, central Japan

2020 ◽  
Vol 126 (9) ◽  
pp. 473-491
Author(s):  
Yasuo Ishizaki ◽  
Aki Nigorikawa ◽  
Nobuko Kametani ◽  
Mitsuhiro Yoshimoto ◽  
Akihiko Terada
Keyword(s):  
Central Japan ◽  
History Of ◽  
Pyroclastic Cone ◽  
Eruption History

scholarly journals Cosmic flow around local massive galaxies

2017 ◽  
Vol 609 ◽  
pp. A11 ◽  
Author(s):  
Olga G. Kashibadze ◽  
Igor D. Karachentsev
Keyword(s):  
Total Mass ◽  
Local Group ◽  
Model Parameters ◽  
Massive Galaxies ◽  
Cosmic Expansion ◽  
Velocity Surface ◽  
Optimal Estimates ◽  
Virial Mass ◽  
Mass Estimate ◽  
Zero Velocity Surface

Aims. We use accurate data on distances and radial velocities of galaxies around the Local Group, as well as around 14 other massive nearby groups, to estimate their radius of the zero-velocity surface, R0, which separates any group against the global cosmic expansion. Methods. Our R0 estimate was based on fitting the data to the velocity field expected from the spherical infall model, including effects of the cosmological constant. The reported uncertainties were derived by a Monte Carlo simulation. Results. Testing various assumptions about a location of the group barycentre, we found the optimal estimates of the radius to be 0.91 ± 0.05 Mpc for the Local Group, and 0.93 ± 0.02 Mpc for a synthetic group stacked from 14 other groups in the Local Volume. Under the standard Planck model parameters, these quantities correspond to the total mass of the group ~ (1.6 ± 0.2) × 1012M⊙. Thus, we are faced with the paradoxical result that the total mass estimate on the scale of R0 ≈ (3−4)Rvir is only 60% of the virial mass estimate. Anyway, we conclude that wide outskirts of the nearby groups do not contain a large amount of hidden mass outside their virial radius.

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