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Processes during the Matsushiro, Japan, Earthquake Swarm as Revealed by Leveling, Gravity, and Spring-Flow Observations

1975; Geological Society of America; Volume: 3; Issue: 2 Linguagem: Inglês

10.1130/0091-7613(1975)3 2.0.co;2

1943-2682

Carl Kisslinger,

Geological and Geochemical Analysis

Research Article| February 01, 1975 Processes during the Matsushiro, Japan, Earthquake Swarm as Revealed by Leveling, Gravity, and Spring-Flow Observations Carl Kisslinger Carl Kisslinger 1Cooperative Institute for Research in Environmental Sciences, University of Colorado and National Oceanic and Atmospheric Administration, Boulder, Colorado 80302 Search for other works by this author on: GSW Google Scholar Author and Article Information Carl Kisslinger 1Cooperative Institute for Research in Environmental Sciences, University of Colorado and National Oceanic and Atmospheric Administration, Boulder, Colorado 80302 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1975) 3 (2): 57–62. https://doi.org/10.1130/0091-7613(1975)3 2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Carl Kisslinger; Processes during the Matsushiro, Japan, Earthquake Swarm as Revealed by Leveling, Gravity, and Spring-Flow Observations. Geology 1975;; 3 (2): 57–62. doi: https://doi.org/10.1130/0091-7613(1975)3 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Recently revised leveling data and a more complete set of gravity data show that the uplift accompanying the later part of the Matsushiro swarm in central Honshu can be explained as due to dilatant expansion of the source region during the formation of a new fault. The local dilatancy occurred between the second and third peaks of seismic activity, although some preswarm dilatancy may have taken place in the region. It is likely that water inflow kept the medium saturated during expansion, except possibly for the times of most rapid uplift, when the drop in seismic activity indicates dilatancy hardening. A reasonable amount of horizontal expansion can explain the observed rate of change of gravity during uplift. The gravity measurements carry uncertainties of the same order as the observed changes, but the ensemble of data indicates clear trends during uplift and subsidence. The volume of land subsidence following the peak uplift agrees very closely with the best estimates of anomalous outflow of warm mineral water from springs during the last part of the swarm and supports the conclusion that subsidence was due to closing of water-filled cracks. The local rate of change of gravity during subsidence is very high, 1 mgal/m, and can only partly be accounted for by density increase due to crack closure. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.