The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Salvatore Gambino - One of the best experts on this subject based on the ideXlab platform.
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ground deformation detected by permanent Tiltmeters on mt etna summit the august 23 26 2018 strombolian and effusive activity case
International Journal of Geophysics, 2019Co-Authors: Salvatore Gambino, Giuseppe Falzone, Marco Aloisi, Giuseppe Di Grazia, Angelo Ferro, Giuseppe LaudaniAbstract:Over the last few years, three tilt deep stations (27-30 meters) have been set up in the summit area of Mount Etna volcano. The aim of this challenging project is to record the ground deformations of the summit craters activity with high precision. We considered data related to the August 23-26, 2018, Strombolian and effusive activity. In this case, Tiltmeters recorded variations in the order of 10−7 radians, not observed at the other stations. These changes suggest a shallow contraction source just south of the Southeast Crater. This result, related to the volcanic tremor source, points to the presence of a gas/magma reservoir feeding the Strombolian activity at 1200 m above sea level.
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1 High precision tilt observation at Mt. Etna Volcano, Italy
2016Co-Authors: Salvatore GambinoAbstract:2 In 2007-2008, we installed on Mt. Etna two deep tilt stations using high resolution, self-leveling instruments. These installations are the result of accurate instrument tests, site selection, drilling and sensor positioning that has allowed detecting variations related to the principal diurnal and semidiurnal tides for first time on Mt. Etna using tilt data. We analyzed the tidal effects recorded on tilt signals and we removed tidal effects from signals, thereby allowing to detect changes of about 20 nanoradians with a considerable improvement respect to the previous installation. Tilt changes have accompanied the Mt. Etna main eruptive phases and are generally related to the rapid rise of magma and formation of dikes and eruptive fissures. However, tilt changes characterize lava fountains, earthquakes and inflation-deflation phases. The 2008-2009 eruption represents an example of the potential of these Tiltmeters providing new perspectives for highly precise monitoring of ground deformation on volcanoes
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volcanic processes detected by Tiltmeters a review of experience on sicilian volcanoes
Journal of Volcanology and Geothermal Research, 2014Co-Authors: Salvatore Gambino, Giuseppe Falzone, Angelo Ferro, Giuseppe LaudaniAbstract:Abstract A review of the experience gained in the use of Tiltmeters on Mt. Etna, Stromboli and Vulcano during the last 30 years is reported here. Tilt data represent a fundamental contribution towards understanding volcanic processes such as dike intrusions, fracture propagation, lava fountains and volume changes in magmatic or hydrothermal systems causing a deflation/inflation of the edifice. Intrusive processes preceding lateral eruptions show large variations (up to over 100 microradians), while minor variations (not exceeding 2.5 microradians) are linked to lava fountains that form ash plumes and lead to fallout deposits that cause severe hazards to aviation. High precision tilt also allows detecting the slight ground deformation linked to strombolian activity (0.01–0.2 microradians) as well as co-seismic variations (0.1–1.5 microradians) and tidal effects (0.1–0.2 microradians) that may have a role in the evolution of a volcanic system. Time–amplitude tilt ranges linked to each process are generally different allowing to discriminate, in real time, between a signal associated to one process and another one. This fact is important in terms of early warning particularly during the first phases of dikes propagation that precede a lateral eruption by hours–days.
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an investigation into shallow borehole Tiltmeters
Geophysical Research Letters, 1999Co-Authors: Alessandro Onaccorso, Giuseppe Falzone, Salvatore GambinoAbstract:Shallow borehole Tiltmeters are frequently used for ground deformation monitoring in volcanic areas, where they are usually installed within a few meters of the surface. A major problem concerns the noise affecting the installation at shallow depth where large tilt and strain are caused by temperature effects. The long term stability of these instruments and the best shallow depth of installation, in terms of best cost/benefit, are the crucial points. We conducted an experiment in order to compare the signals of three shallow borehole electronic Tiltmeters installed in the same place at different depths. We verified the signal reliability in revealing the long term slow deformation and looked into the reduction of the temperature effects with depth. We present three years of data and discuss the limits and the advantages of the different installation depths.
Terrence Peter Haines - One of the best experts on this subject based on the ideXlab platform.
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the tiltmeter app is a novel and accurate measurement tool for the weight bearing lunge test
Journal of Science and Medicine in Sport, 2013Co-Authors: Cylie Williams, Angelo Justin Caserta, Terrence Peter HainesAbstract:Abstract Objectives The weight bearing lunge test is increasing being used by health care clinicians who treat lower limb and foot pathology. This measure is commonly established accurately and reliably with the use of expensive equipment. This study aims to compare the digital inclinometer with a free app, TiltMeter on an Apple iPhone. Design This was an intra-rater and inter-rater reliability study. Two raters (novice and experienced) conducted the measurements in both a bent knee and straight leg position to determine the intra-rater and inter-rater reliability. Concurrent validity was also established. Methods Allied health practitioners were recruited as participants from the workplace. A preconditioning stretch was conducted and the ankle range of motion was established with the weight bearing lunge test position with firstly the leg straight and secondly with the knee bent. The measurement device and each participant were randomised during measurement. Results The intra-rater reliability and inter-rater reliability for the devices and in both positions were all over ICC 0.8 except for one intra-rater measure (Digital inclinometer, novice, ICC 0.65). The inter-rater reliability between the digital inclinometer and the tilmeter was near perfect, ICC 0.96 (CI: 0.898–0.983); Concurrent validity ICC between the two devices was 0.83 (CI: −0.740 to 0.445). Conclusions The use of the Tiltmeter app on the iPhone is a reliable and inexpensive tool to measure the available ankle range of motion. Health practitioners should use caution in applying these findings to other smart phone equipment if surface areas are not comparable.
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the tiltmeter app is a novel and accurate measurement tool for the weight bearing lunge test
Journal of Foot and Ankle Research, 2013Co-Authors: Cylie Williams, Angelo Justin Caserta, Terrence Peter HainesAbstract:Results The intra-rater reliability and inter-rater reliability for the devices and in both positions were all over ICC 0.8 except for one intra-rater measure (Digital inclinometer, novice, ICC 0.65). The inter-rater reliability between the digital inclinometer and the TiltMeter was near perfect, ICC 0.96 (CI: 0.898–0.983); Concurrent validity ICC between the two devices was 0.83 (CI: -0.740–0.445).
Giuseppe Falzone - One of the best experts on this subject based on the ideXlab platform.
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ground deformation detected by permanent Tiltmeters on mt etna summit the august 23 26 2018 strombolian and effusive activity case
International Journal of Geophysics, 2019Co-Authors: Salvatore Gambino, Giuseppe Falzone, Marco Aloisi, Giuseppe Di Grazia, Angelo Ferro, Giuseppe LaudaniAbstract:Over the last few years, three tilt deep stations (27-30 meters) have been set up in the summit area of Mount Etna volcano. The aim of this challenging project is to record the ground deformations of the summit craters activity with high precision. We considered data related to the August 23-26, 2018, Strombolian and effusive activity. In this case, Tiltmeters recorded variations in the order of 10−7 radians, not observed at the other stations. These changes suggest a shallow contraction source just south of the Southeast Crater. This result, related to the volcanic tremor source, points to the presence of a gas/magma reservoir feeding the Strombolian activity at 1200 m above sea level.
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volcanic processes detected by Tiltmeters a review of experience on sicilian volcanoes
Journal of Volcanology and Geothermal Research, 2014Co-Authors: Salvatore Gambino, Giuseppe Falzone, Angelo Ferro, Giuseppe LaudaniAbstract:Abstract A review of the experience gained in the use of Tiltmeters on Mt. Etna, Stromboli and Vulcano during the last 30 years is reported here. Tilt data represent a fundamental contribution towards understanding volcanic processes such as dike intrusions, fracture propagation, lava fountains and volume changes in magmatic or hydrothermal systems causing a deflation/inflation of the edifice. Intrusive processes preceding lateral eruptions show large variations (up to over 100 microradians), while minor variations (not exceeding 2.5 microradians) are linked to lava fountains that form ash plumes and lead to fallout deposits that cause severe hazards to aviation. High precision tilt also allows detecting the slight ground deformation linked to strombolian activity (0.01–0.2 microradians) as well as co-seismic variations (0.1–1.5 microradians) and tidal effects (0.1–0.2 microradians) that may have a role in the evolution of a volcanic system. Time–amplitude tilt ranges linked to each process are generally different allowing to discriminate, in real time, between a signal associated to one process and another one. This fact is important in terms of early warning particularly during the first phases of dikes propagation that precede a lateral eruption by hours–days.
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an investigation into shallow borehole Tiltmeters
Geophysical Research Letters, 1999Co-Authors: Alessandro Onaccorso, Giuseppe Falzone, Salvatore GambinoAbstract:Shallow borehole Tiltmeters are frequently used for ground deformation monitoring in volcanic areas, where they are usually installed within a few meters of the surface. A major problem concerns the noise affecting the installation at shallow depth where large tilt and strain are caused by temperature effects. The long term stability of these instruments and the best shallow depth of installation, in terms of best cost/benefit, are the crucial points. We conducted an experiment in order to compare the signals of three shallow borehole electronic Tiltmeters installed in the same place at different depths. We verified the signal reliability in revealing the long term slow deformation and looked into the reduction of the temperature effects with depth. We present three years of data and discuss the limits and the advantages of the different installation depths.
Cylie Williams - One of the best experts on this subject based on the ideXlab platform.
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the tiltmeter app is a novel and accurate measurement tool for the weight bearing lunge test
Journal of Science and Medicine in Sport, 2013Co-Authors: Cylie Williams, Angelo Justin Caserta, Terrence Peter HainesAbstract:Abstract Objectives The weight bearing lunge test is increasing being used by health care clinicians who treat lower limb and foot pathology. This measure is commonly established accurately and reliably with the use of expensive equipment. This study aims to compare the digital inclinometer with a free app, TiltMeter on an Apple iPhone. Design This was an intra-rater and inter-rater reliability study. Two raters (novice and experienced) conducted the measurements in both a bent knee and straight leg position to determine the intra-rater and inter-rater reliability. Concurrent validity was also established. Methods Allied health practitioners were recruited as participants from the workplace. A preconditioning stretch was conducted and the ankle range of motion was established with the weight bearing lunge test position with firstly the leg straight and secondly with the knee bent. The measurement device and each participant were randomised during measurement. Results The intra-rater reliability and inter-rater reliability for the devices and in both positions were all over ICC 0.8 except for one intra-rater measure (Digital inclinometer, novice, ICC 0.65). The inter-rater reliability between the digital inclinometer and the tilmeter was near perfect, ICC 0.96 (CI: 0.898–0.983); Concurrent validity ICC between the two devices was 0.83 (CI: −0.740 to 0.445). Conclusions The use of the Tiltmeter app on the iPhone is a reliable and inexpensive tool to measure the available ankle range of motion. Health practitioners should use caution in applying these findings to other smart phone equipment if surface areas are not comparable.
-
the tiltmeter app is a novel and accurate measurement tool for the weight bearing lunge test
Journal of Foot and Ankle Research, 2013Co-Authors: Cylie Williams, Angelo Justin Caserta, Terrence Peter HainesAbstract:Results The intra-rater reliability and inter-rater reliability for the devices and in both positions were all over ICC 0.8 except for one intra-rater measure (Digital inclinometer, novice, ICC 0.65). The inter-rater reliability between the digital inclinometer and the TiltMeter was near perfect, ICC 0.96 (CI: 0.898–0.983); Concurrent validity ICC between the two devices was 0.83 (CI: -0.740–0.445).
Alessandro Onaccorso - One of the best experts on this subject based on the ideXlab platform.
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an investigation into shallow borehole Tiltmeters
Geophysical Research Letters, 1999Co-Authors: Alessandro Onaccorso, Giuseppe Falzone, Salvatore GambinoAbstract:Shallow borehole Tiltmeters are frequently used for ground deformation monitoring in volcanic areas, where they are usually installed within a few meters of the surface. A major problem concerns the noise affecting the installation at shallow depth where large tilt and strain are caused by temperature effects. The long term stability of these instruments and the best shallow depth of installation, in terms of best cost/benefit, are the crucial points. We conducted an experiment in order to compare the signals of three shallow borehole electronic Tiltmeters installed in the same place at different depths. We verified the signal reliability in revealing the long term slow deformation and looked into the reduction of the temperature effects with depth. We present three years of data and discuss the limits and the advantages of the different installation depths.
