scholarly journals Source mechanism of long-period events recorded by a high-density seismic network during the 2008 eruption on Mount Etna

2011 ◽  
Vol 116 (B1) ◽  
Author(s):  
L. De Barros ◽  
I. Lokmer ◽  
C. J. Bean ◽  
G. S. O'Brien ◽  
G. Saccorotti ◽  
...  
Keyword(s):  
High Density ◽  
Seismic Network ◽  
Source Mechanism ◽  
Mount Etna ◽  
Long Period

Performance of a rotational sensor at Etna, Italy focusing on back-azimuth estimations of volcano-seismic events

2021 ◽  
Author(s):  
Martina Rosskopf ◽  
Eva P. S. Eibl ◽  
Gilda Currenti ◽  
Philippe Jousset ◽  
Joachim Wassermann ◽  
...  
Keyword(s):  
Rotation Rate ◽  
Mount Etna ◽  
Seismic Events ◽  
Volcano Seismology ◽  
Rotational Seismology ◽  
Long Period ◽  
Tectonic Events ◽  
Back Azimuth ◽  
Seismic Wavefield

<p>The field of rotational seismology has only recently emerged. Portable 3 component rotational sensors are commercially available since a few years which opens the pathway for a first use in volcano-seismology. The combination of rotational and translational components of the wavefield allows identifying and filtering for specific seismic wave types, estimating the back azimuth of an earthquake, and calculating local seismic phase velocities.</p><p>Our work focuses on back-azimuth calculations of volcano-tectonic and long-period events detected at Etna volcano in Italy. Therefore, a continuous full seismic wavefield of 30 days was recorded by a BlueSeis-3A, the first portable rotational sensor, and a broadband Trillium Compact seismometer located next to each other at Mount Etna in August and September of 2019. In this study, we applied two methods for back-azimuth calculations. The first one is based on the similarity of the vertical rotation rate to the horizontal acceleration and the second one uses a polarization analysis from the two horizontal components of the rotation rate. The estimated back-azimuths for volcano-tectonic events were compared to theoretical back-azimuths based on the INGV event catalog and the long-period event back-azimuths were analyzed for their dominant directions. We discuss the quality of our back azimuths with respect to event locations and evaluate the sensitivity and benefits of the rotational sensor focusing on volcano-seismic events on Etna regarding the signal to noise ratios, locations, distances, and magnitudes.</p>

scholarly journals A High-Density Seismic Network for Earthquake Early Warning in Taiwan Based on Low Cost Sensors

2013 ◽  
Vol 84 (6) ◽  
pp. 1048-1054 ◽  
Author(s):  
Y.-M. Wu ◽  
D.-Y. Chen ◽  
T.-L. Lin ◽  
C.-Y. Hsieh ◽  
T.-L. Chin ◽  
...  
Keyword(s):  
Early Warning ◽  
Low Cost ◽  
High Density ◽  
Seismic Network ◽  
Earthquake Early Warning

scholarly journals The coupling between very long period seismic events, volcanic tremor, and degassing rates at Mount Etna volcano

2013 ◽  
Vol 118 (9) ◽  
pp. 4910-4921 ◽  
Author(s):  
Luciano Zuccarello ◽  
Michael R. Burton ◽  
Gilberto Saccorotti ◽  
Christopher J. Bean ◽  
Domenico Patanè
Keyword(s):  
Volcanic Tremor ◽  
Mount Etna ◽  
Seismic Events ◽  
Etna Volcano ◽  
Long Period

scholarly journals Improvement of broadband seismic station installations at the Observatoire de Grenoble (OSUG) seismic network

2013 ◽  
Vol 34 ◽  
pp. 9-14 ◽  
Author(s):  
M. Langlais ◽  
B. Vial ◽  
O. Coutant
Keyword(s):  
Seismic Station ◽  
Seismic Network ◽  
Protection System ◽  
French Alps ◽  
Long Period ◽  
Seismic Recording ◽  
Seismic Networks

Abstract. We describe in this paper different improvements that were brought to the installation of seismic broadband stations deployed by the Observatoire de Grenoble (OSUG) in the northern French Alps. This work was realized in the frame of a French-Italian ALCOTRA project (RISE), aimed at modernizing the broadband seismic networks across our common border. We had the opportunity with this project to improve some of our seismic recording sites, both in term of sensor installation quality, and in term of reliability. We detail in particular the thermal and barometric protection system that we designed and show its effect on the reduction of long period noise above 20 s.

Long period analysis in blends of high-density and lowdensity polyethylene

e-Polymers ◽  
2001 ◽  
Vol 1 (1) ◽  
Author(s):  
Fadhel Ben Cheikh Larbi ◽  
Jean Louis Halary
Keyword(s):  
Distribution Function ◽  
Thickness Distribution ◽  
High Density ◽  
Period Analysis ◽  
Polymeric Systems ◽  
Long Period ◽  
X Ray Scattering ◽  
Saxs Intensity ◽  
Amorphous Domain ◽  
Lamella Thickness

AbstractLong period calculations from small angle X-ray scattering experiments (SAXS) is a well-known way to describe biphasic polymeric systems. In the case of semi-crystalline homopolymers, more and more sophisticated models have been proposed to account for the SAXS intensity profiles. However, they use too many parameters to be applied to systems including two crystalline phases and an amorphous phase. Therefore, we propose a crude alternative, based on a generalization of the old paracrystalline Hoseman model, in order to consider the case of blends of high-density (HDPE) and low-density (LDPE) polyethylene. The crystalline lamella thickness distribution function is taken as the sum of two Gaussians (bimodal function 2G). As far as the amorphous domain thickness distribution function is concerned, either an exponential distribution (E) or a Gaussian distribution (G) is used. The model 2G/G proves to be much more realistic than the model 2G/E, with respect to the long period evolution as a function of HDPE/LDPE blend composition.

Source mechanism of very-long-period signals accompanying dome growth activity at Merapi volcano, Indonesia

2002 ◽  
Vol 29 (23) ◽  
pp. 33-1-33-4 ◽  
Author(s):  
D. Hidayat ◽  
B. Chouet ◽  
B. Voight ◽  
P. Dawson ◽  
A. Ratdomopurbo
Keyword(s):  
Source Mechanism ◽  
Merapi Volcano ◽  
Long Period ◽  
Dome Growth ◽  
Growth Activity

scholarly journals Correction to “Source mechanism of very-long-period signals accompanying dome growth activity at Merapi volcano, Indonesia”

2003 ◽  
Vol 30 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
D. Hidayat ◽  
B. Chouet ◽  
B. Voight ◽  
P. Dawson ◽  
A. Ratdomopurbo
Keyword(s):  
Source Mechanism ◽  
Merapi Volcano ◽  
Long Period ◽  
Dome Growth ◽  
Growth Activity
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