The great activity of Komagataké in 1929

Kôzu, Shukusuké

doi:10.1007/bf02943370

Cited by 19 publications

(10 citation statements)

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“…Figure 9 shows the thermal history of juvenile and lithic coarse fragments during transport and following deposition from a hypothetical PDC. The temperature of the PDC is assumed to vary rapidly during flow (from 600° to 400°C) because of efficient turbulent admixing of air in the cloud, while the cooling history of the whole deposit is assumed to be similar to that observed for small‐scale PDC deposits [ Kozu , 1934; Ryan et al , 1990], and to the thermal modeling proposed by Miller [1990] and Riehle et al [1995]. The main result of these calculations is that coarse juvenile and lithic fragments completely equilibrate with the rest of the deposit one to several hours after deposition.…”

Section: Discussionmentioning

confidence: 99%

“…Thermal history of juvenile and lithic coarse fragments during transport and after deposition from a small PDC, characterized by a temperature decrease from 600° to 400°C due to very efficient air incorporation. The cooling history of the deposit is derived from temperature measurements taken on small‐sized PDC deposit by Kozu [1934] and Ryan et al [1990] and from the thermal modeling proposed by Miller [1990] and Riehle et al [1995]. Both juvenile and lithic coarse fragments reach complete equilibration with the whole deposit several hours after deposition.…”

Section: Discussionmentioning

confidence: 99%

“…deposits [Kozu, 1934;Ryan et al, 1990], and to the thermal modeling proposed by Miller [1990] and Riehle et al [1995]. The main result of these calculations is that coarse juvenile and lithic fragments completely equilibrate with the rest of the deposit one to several hours after deposition.…”

Section: Timing Of Thermal Equilibration Between Clasts and The Gas-amentioning

confidence: 99%

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Temperatures of the A.D. 79 pyroclastic density current deposits (Vesuvius, Italy)

Cioni¹,

Gurioli

Lanza³

et al. 2004

J. Geophys. Res.

112

187

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[1] The temperature of the deposits left by different types of pyroclastic density currents (PDCs) of the A.D. 79 ''Pompei'' eruption of Vesuvius was estimated by measuring the thermal remanent magnetization (TRM) of lithic clasts carried by the currents. More than 200 lava clasts and roof tile fragments were collected at different sites and distances from the vent. The estimated temperatures fall in the range 180-380°C, although most of the samples show temperatures (T) in the range 240-340°C. This interval occurs for both the deposits of the same eruptive unit sampled at different sites and those derived from PDCs with similar physical characteristics. The sedimentological features coupled with the TRM data allow us to highlight the main processes controlling the T variability of the deposits and of their emplacing currents. The results reveal that air ingestion, involvement of external water, as well as transport and emplacement processes of the PDC are the most important factors in decreasing the emplacement T. The amount of lithic clasts carried by the currents does not play an important role in changing the final temperature because of the grain size and initial high T of these fragments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Temperatures of the A.D. 79 pyroclastic density current deposits (Vesuvius, Italy)

Cioni¹,

Gurioli

Lanza³

et al. 2004

J. Geophys. Res.

112

187

View full text Add to dashboard Cite

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“…The nature of the ash-flow concept as it is understood at the present time implies that a· deposit of this material would give off gases for a long time after its emplacement. Just how long may be seen from Kozu's (1934) study of the pumice flows from the 1929 eruption of Komagatake and from the studies of the sand flow of the Valley of Ten Thousand Smokes. These deposits were still giving off vapors years after they were formed (see p. 41).…”

Section: Erosion Formsmentioning

confidence: 99%

Ash-flow tuffs: Their origin, geologic relations, and identification

Ross¹,

Smith²

1961

Professional Paper

275

200

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“…Kozu, 1934;Ryan et al, 1990), which indicate these deposits are able to maintain internal temperatures between 300 and 400°C for several days (Cioni et al, 2004). A thermal survey performed on small-volume hot debris avalanche deposits occurred at Stromboli volcano on December 29th, 2002, demonstrated that it maintained its internal temperature between 200 and 300°C for more than three months, irrespectively of the rapid cooling of the external part that passed from 350-400°C to less than 100°C in about 25 days (Calvari et al, 2005).…”

Section: Attainment Of Thermal Equilibrium In Pdcsmentioning

confidence: 99%

Deposition temperature of some PDC deposits from the 1982 eruption of El Chichón volcano (Chiapas, Mexico) inferred from rock-magnetic data

Sulpizio

Zanella

Macías

2008

Journal of Volcanology and Geothermal Research

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Thermal remanent magnetization (TRM) analyses were carried out on lithic fragments from two different typologies of pyroclastic density current (PDC) deposits of the 1982 eruption of El Chichón volcano, in order to estimate their equilibrium temperature (T dep ) after deposition. The estimated T dep range is 360-400°C, which overlaps the direct measurements of temperature carried out four days after the eruption on the PDC deposits. This overlap demonstrates the reliability of the TRM method to estimate the T dep of pyroclastic deposits and to approximate their depositional temperature. These results also constraint the time needed for reaching thermal equilibrium within four days for the studied PDC deposits, in agreement with predictions of theoretical models. Sedimentological analysis demonstrates that different thickness of aggrading granular dominated pulses does not affect significantly the estimated T dep for the two studied PDCs. The component analysis highlights how the entrapment of a significant amount of pre-heated lithic fragments from the dome and the conduit walls reduced the cooling of the pyroclastic mixture.

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The great activity of Komagataké in 1929

Cited by 19 publications

References 0 publications

Temperatures of the A.D. 79 pyroclastic density current deposits (Vesuvius, Italy)

Temperatures of the A.D. 79 pyroclastic density current deposits (Vesuvius, Italy)

Ash-flow tuffs: Their origin, geologic relations, and identification

Deposition temperature of some PDC deposits from the 1982 eruption of El Chichón volcano (Chiapas, Mexico) inferred from rock-magnetic data

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