50 research outputs found
A seismic array on Mt. Vesuvius
In November 1997 a seismic antenna (array) of short period seismometers was
installed on the south-western flank of Mt. Vesuvius; aim of the experiment was to test the
use of non-conventional devices for the seismic monitoring of this volcano. In 7 months local
seismicity, regional earthquakes and samples of seismic noise were recorded by the array and
organised in a data base.
Local earthquakes and seismic noise have been analysed with array techniques to
investigate the spectral, kinematic and polarization properties of the wavefield. Preliminary
results show that the backazimuth of local earthquakes is oriented in the direction of the crater
area. For some events, the source location has been constrained using a simplified back
propagation in a 2-D velocity structure.
The noise wavefield is characterized by the predominance of a sustained low frequency
component (< 1Hz) whose source is located S-SE of the array. This low frequency signal has
been interpreted as associated to the sea-loading in the gulf of Naples.Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio VesuvianoPublished1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attiveope
Twin digital short period seismic Array Experiment at Stromboli Volcano
Two small arrays composed by short period (1 Hz) digital seismic
stations, with an aperture of approximately 400 meters, were set up at
Stromboli volcano (one at semaforo Labronzo, the other at Ginostra-
Timpone del Fuoco) with the purpose of the spatial location of the high
frequency source of the explosion quakes.
About 75 explosion-quakes were recorded at both arrays, and
constitute the available data base.
We have planned to apply the zero-lag cross-correlation technique to
the whole data set in order to obtain back-azimuth and apparent
slowness of the coherent seismic phases. A preliminary analysis for
both arrays show that the predominant back-azimuth for the first phase
is oriented in the direction of , but not strictly coincident to, the crater
area. Moreover some back-scattered arrivals are quite evident in the
seismogram.INGV - Osservatorio VesuvianoUnpublishedope
A seismic array on Mt. Vesuvius
In November 1997 a seismic antenna (array) of short period seismometers was
installed on the south-western flank of Mt. Vesuvius; aim of the experiment was to test the
use of non-conventional devices for the seismic monitoring of this volcano. In 7 months local
seismicity, regional earthquakes and samples of seismic noise were recorded by the array and
organised in a data base.
Local earthquakes and seismic noise have been analysed with array techniques to
investigate the spectral, kinematic and polarization properties of the wavefield. Preliminary
results show that the backazimuth of local earthquakes is oriented in the direction of the crater
area. For some events, the source location has been constrained using a simplified back
propagation in a 2-D velocity structure.
The noise wavefield is characterized by the predominance of a sustained low frequency
component (< 1Hz) whose source is located S-SE of the array. This low frequency signal has
been interpreted as associated to the sea-loading in the gulf of Naples
Twin digital short period seismic Array Experiment at Stromboli Volcano
Two small arrays composed by short period (1 Hz) digital seismic
stations, with an aperture of approximately 400 meters, were set up at
Stromboli volcano (one at semaforo Labronzo, the other at Ginostra-
Timpone del Fuoco) with the purpose of the spatial location of the high
frequency source of the explosion quakes.
About 75 explosion-quakes were recorded at both arrays, and
constitute the available data base.
We have planned to apply the zero-lag cross-correlation technique to
the whole data set in order to obtain back-azimuth and apparent
slowness of the coherent seismic phases. A preliminary analysis for
both arrays show that the predominant back-azimuth for the first phase
is oriented in the direction of , but not strictly coincident to, the crater
area. Moreover some back-scattered arrivals are quite evident in the
seismogram
Findings of the WMT 2021 Biomedical Translation Shared Task: Summaries of Animal Experiments as New Test Set
In the sixth edition of the WMT Biomedical Task, we addressed a total of eight language pairs, namely English/German, English/French, English/Spanish, English/Portuguese, English/Chinese, English/Russian, English/Italian, and English/Basque. Further, our tests were composed of three types of textual test sets. New to this year, we released a test set of summaries of animal experiments, in addition to the test sets of scientific abstracts and terminologies. We received a total of 107 submissions from 15 teams from 6 countries
ESWT - tracking organs during focused ultrasound surgery
We report here our results in a multi-sensor setup reproducing the conditions of an automated focused ultrasound surgery environment. The aim is to continuously predict the position of an internal organ (here the liver) under guided and non-guided free breathing, with the accuracy required by surgery. We have performed experiments with 16 healthy human subjects, two of those taking part in full-scale experiments involving a 3 Tesla MRI machine recording a volume containing the liver. For the other 14 subjects we have used the optical tracker as a surrogate target. All subjects where volunteers who agreed to participate in the experiments after being thoroughly informed about it. For the MRI sessions we have analyzed semi-automatically offline the images in order to obtain the ground truth, the true position of the selected feature of the liver. The results we have obtained with continuously updated random forest models are very promising, we have obtained good prediction-target correlation coefficients for the surrogate targets (0.71 ± 0.1) and excellent for the real targets in the MRI experiments (over 0.91), despite being limited to a lower model update frequency, once every 6.16 seconds