{
"USGS Publications Warehouse": {
"@context": "https://schema.org",
"@type": "Article",
"additionalType": "Journal Article",
"name": "Inflation rates, rifts, and bands in a p\u0101hoehoe sheet flow",
"identifier": [
{
"@type": "PropertyValue",
"propertyID": "USGS Publications Warehouse IndexID",
"value": "70118322",
"url": "https://pubs.usgs.gov/publication/70118322"
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"propertyID": "USGS Publications Warehouse Internal ID",
"value": 70118322
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"propertyID": "DOI",
"value": "10.1130/GES00656.1",
"url": "https://doi.org/10.1130/GES00656.1"
}
],
"journal": {
"@type": "Periodical",
"name": "Geosphere",
"volumeNumber": "8",
"issueNumber": "1"
},
"inLanguage": "en",
"isPartOf": [
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"@type": "CreativeWorkSeries",
"name": "Geosphere"
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],
"datePublished": "2012",
"dateModified": "2019-05-30",
"abstract": "The margins of sheet flows\u2014p\u0101hoehoe lavas emplaced on surfaces sloping <2\u00b0\u2014are typically delineated by structures that form to accommodate vertical flow inflation. We refer to these structures as inflation rifts. The surfaces of inflation rifts almost always exhibit bands of varying color and texture. Various explanations for the bands have been proposed, but active band formation has never been documented. In order to test our hypothesis that banding is caused by changes in the inflation rate, we collected time-lapse photographs of the margin of an actively inflating flow and simultaneously measured the height of the flow with an extensometer. Data collected over a period of \u223c1 d indicate that the height of the flow margin changed in a stepwise manner and that rate changes correlate with band formation. This confirms our hypothesis.\n\nInflation and rift-band formation is probably cyclic, because the pattern we observed suggests episodic or crude cyclic behavior. Furthermore, some inflation rifts contain numerous bands whose spacing and general appearances are remarkably similar.\n\nWe propose a conceptual model wherein the inferred cyclicity is due to the competition between the fluid pressure in the flow's liquid core and the tensile strength of the viscoelastic layer where it is weakest\u2014in inflation rifts. The viscoelastic layer consists of lava that has cooled to temperatures between 800 and 1070 \u00b0C. This layer is the key parameter in our model because, in its absence, rift banding and stepwise changes in the flow height would not occur.",
"description": "17 p.",
"publisher": {
"@type": "Organization",
"name": "Geological Society of America"
},
"author": [
{
"@type": "Person",
"name": "Cervelli, Peter F. pcervelli@usgs.gov",
"givenName": "Peter F.",
"familyName": "Cervelli",
"email": "pcervelli@usgs.gov",
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"propertyID": "ORCID",
"value": "0000-0001-6765-1009",
"url": "https://orcid.org/0000-0001-6765-1009"
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"affiliation": [
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"@type": "Organization",
"name": "Volcano Science Center",
"url": "https://www.usgs.gov/centers/volcano-science-center"
}
]
},
{
"@type": "Person",
"name": "Hoblitt, Richard P. rhoblitt@usgs.gov",
"givenName": "Richard P.",
"familyName": "Hoblitt",
"email": "rhoblitt@usgs.gov",
"affiliation": [
{
"@type": "Organization",
"name": "Cascades Volcano Observatory",
"url": "https://www.usgs.gov/cascades-volcano-observatory"
}
]
},
{
"@type": "Person",
"name": "Denlinger, Roger P. roger@usgs.gov",
"givenName": "Roger P.",
"familyName": "Denlinger",
"email": "roger@usgs.gov",
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"value": "0000-0003-0930-0635",
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"name": "Volcano Hazards Program",
"url": "https://www.usgs.gov/programs/VHP"
},
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"name": "Volcano Science Center",
"url": "https://www.usgs.gov/centers/volcano-science-center"
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{
"@type": "Person",
"name": "Hon, Ken",
"givenName": "Ken",
"familyName": "Hon"
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{
"@type": "Person",
"name": "Heliker, Christina",
"givenName": "Christina",
"familyName": "Heliker",
"affiliation": [
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"@type": "Organization",
"name": "Hawaiian Volcano Observatory",
"url": "https://www.usgs.gov/observatories/hvo"
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"@type": "Person",
"name": "Orr, Tim R.",
"givenName": "Tim R.",
"familyName": "Orr",
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"name": "Hawaiian Volcano Observatory",
"url": "https://www.usgs.gov/observatories/hvo"
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"@type": "Organization",
"name": "Volcano Hazards Program",
"url": "https://www.usgs.gov/programs/VHP"
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