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We present a seismoacoustic analysis of debris flow activity at Illgraben, Switzerland, with infrasound data collected with a small aperture array. Events are recorded as emergent signals of long duration, with seismic and infrasound amplitudes scaling with the flow discharge. The spectral content is stable and peaking at 8\u00a0Hz for the seismic and at 5\u00a0Hz for the infrasound that suggests two separate processes of elastic energy radiation, most likely bed\u2010load transport for the seismic and waves at the free surface for the infrasound. Although amplitude and frequency content of the infrasound signal are well within the processing limits, most of the signal is not showing any correlation among the array elements. We suggest that this is a consequence of the contribution of multiple sources of infrasound acting with variable amplitude and phase along the surface of the debris flow. At Illgraben, coherent infrasound is recorded only from fixed sources, corresponding to check dams within the channel. Here infrasound radiation is increased and the dams turn into predominant sources of energy. This allows to unambiguously identify the occurrence of debris flow at Illgraben with the infrasound array, from a remote and safe position and with a timing that is similar to the early warning system based on in\u2010channel sensors. This clearly shows how infrasound arrays could be used as an efficient early warning systems.<\/jats:p>","DOI":"10.1029\/2018jf004785","type":"journal-article","created":{"date-parts":[[2019,2,2]],"date-time":"2019-02-02T10:08:09Z","timestamp":1549102089000},"page":"567-587","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":72,"title":["Infrasound Array Analysis of Debris Flow Activity and Implication for Early Warning"],"prefix":"10.1029","volume":"124","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4131-6143","authenticated-orcid":false,"given":"E.","family":"Marchetti","sequence":"first","affiliation":[{"name":"Department of Earth Sciences University of Firenze  Firenze Italy"}]},{"given":"F.","family":"Walter","sequence":"additional","affiliation":[{"name":"Laboratory of Hydraulics, Hydrology and Glaciology ETH  Z\u00fcrich Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9861-9159","authenticated-orcid":false,"given":"G.","family":"Barfucci","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University of Firenze  Firenze Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2377-065X","authenticated-orcid":false,"given":"R.","family":"Genco","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University of Firenze  Firenze Italy"}]},{"given":"M.","family":"Wenner","sequence":"additional","affiliation":[{"name":"Laboratory of Hydraulics, Hydrology and Glaciology ETH  Z\u00fcrich Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1787-5618","authenticated-orcid":false,"given":"M.","family":"Ripepe","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University of Firenze  Firenze Italy"}]},{"given":"B.","family":"McArdell","sequence":"additional","affiliation":[{"name":"WSL, Swiss Federal Institute for Forest, Snow and Landscape Research  Birmensdorf Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1387-7632","authenticated-orcid":false,"given":"C.","family":"Price","sequence":"additional","affiliation":[{"name":"Department of Geosciences Tel Aviv University  Tel Aviv Israel"}]}],"member":"13","published-online":{"date-parts":[[2019,2,14]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jvolgeores.2018.09.007"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.5194\/nhess-5-137-2005"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11069-008-9303-x"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1029\/2018GL078243"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.geomorph.2012.11.029"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1029\/2010JF001722"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1029\/2005GL022486"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1029\/2007JB005034"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1080\/02533839.2012.730269"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1144\/M39.9"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1029\/2000GL011859"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.3813\/AAA.918702"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/2014JF003201"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.2495\/SAFE-V3-N2-105-115"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1139\/t02-087"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/2015GL065024"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/2015GL064811"},{"key":"e_1_2_10_19_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11069-011-9741-8"},{"key":"e_1_2_10_20_1","doi-asserted-by":"publisher","DOI":"10.5194\/nhess-11-2355-2011"},{"key":"e_1_2_10_21_1","doi-asserted-by":"publisher","DOI":"10.1177\/026309239301200404"},{"key":"e_1_2_10_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/2013JB010827"},{"key":"e_1_2_10_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jvolgeores.2012.10.005"},{"key":"e_1_2_10_24_1","doi-asserted-by":"publisher","DOI":"10.1029\/2018GL077683"},{"issue":"4","key":"e_1_2_10_25_1","first-page":"351","article-title":"Infrasound monitoring and early warning of debris flow along montanic railway line","volume":"31","author":"Li C. 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