@InProceedings{SánchezJuarezKheKlaPauMen:2019:GeIoDi,
author = "S{\'a}nchez Juarez, Sa{\'u}l Alejandro and Kherani, Esfhan Alam
and Klausner, Virg{\'{\i}}nia and Paula, Eurico Rodrigues de and
Meneses, Francisco de",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade do Vale
do Para{\'{\i}}ba (UNIVAP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidad Aut{\'o}noma de Nuevo
Le{\'o}n}",
title = "Geomagnetic and Ionospheric Disturbances During Moderate Seismic
Events in South America",
year = "2019",
organization = "AGU Fall Meeting",
abstract = "Seismic-Triggered-Travelling-Ionospheric-Disturbances (SAIDs) can
be generated by seismic activity. Earth displacement due to
earthquakes causes effects on the atmosphere up to 300 km in
height, including the ionosphere region, as a result of the
coupling of the Lithosphere Atmosphere Ionosphere interfaces. In
fact, in the atmosphere, effects are amplified by up to 4 orders
of magnitude, because atmospheric density decreases exponentially.
We use data from magnetometer and GPS stations located in the
South America region. For the time series, spectral analysis
techniques based on the Continuous Wavelet Transform (CWT) and
Hilbert-Huang Transform (HHT) were used. For the moderate
earthquake (Mw=6.3) using GPS receiver data, we detect the
Travelling Ionospheric Disturbances that are associated with an
acoustic wave with a velocity of 0.8 km/s and with slower (0.3 and
0.2 km/s) velocities that may be associated with gravity waves.
Favorable preconditioning offered by non-seismic MSTIDs
contributes to the rise of the seismic detectable level. Using
magnetometer networks, we detect SAIDs in the form of geomagnetic
disturbances that have propagation velocities greater than the
velocity of the primary and secondary waves recorded by
seismographs, and due to the very high velocities, these
disturbances may be associated mainly to the shear or oblique
Alfv{\'e}n waves.",
conference-location = "San Francisco, CA",
conference-year = "09-13 dec.",
language = "en",
targetfile = "sanchez-geomagnetic.pdf",
urlaccessdate = "26 abr. 2024"
}