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The Italian Seismic Bulletin: strategies, revised pickings and locations of the central Italy seismic sequence
Author(s)
Language
English
Obiettivo Specifico
4IT. Banche dati
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
FAST TRACK 5/59 (2016)
Electronic ISSN
2037-416X
Issued date
2016
Alternative Location
Subjects
Abstract
The central Italy seismic sequence, started with the Mw = 6.0 Amatrice earthquake on August 24th 2016, is
the first significant one after the Italian Seismic Bulletin (BSI) changed its analysis strategies in 2015.
These new strategies consist on the release of the BSI every four months, the review of the events with ML ≥
1.5 and the priority on the review of events with ML ≥ 3.5. Furthermore, in the last year we improved the
bulletin tools and made possible the analysis of all the stations whose data are stored in the European Integrated
Data Archive (EIDA). The new procedures and software utilities allowed, during the first month of
2016 emergency, to integrate, in the Bulletin, the temporary stations installed by the emergency group
SISMIKO, both in real–time transmission and in stand-alone recording.
In the early days of the sequence many of the BSI analysts were engaged in the monitoring room shifts,
nevertheless at the end of August all events occurred in those days with ML ≥ 4 were analyzed; the largest
event recovered and localized is a ML = 4.5 event immediately following the main shock.
In September 2016, 83 events with ML ≥ 3.5 were analyzed and re-checked, the number of pickings greatly
improved. The focal mechanism of the main shock was evaluated using first motion polarities, and compared
with the available Time Domain Moment Tensors and Regional Centroid Moment Tensor.
The first eight hours of the day on August 24th, the most critical for the INGV surveillance room, were
carefully analyzed: the number of located events increased from 133 to 408. The magnitude of completeness,
after the analysis of the BSI, has dropped significantly from about 3.5 to 2.7. The mainshock focal
mechanism and the relative locations of the first 8 hours’ aftershocks give clues on the initial fault activation.
The seismic sequence in November 2016 is still ongoing; it included a mainshock of Mw = 6.5 on October
30th and 3 events of magnitude greater than 5.0 one on August 24th and two on October 26th.
the first significant one after the Italian Seismic Bulletin (BSI) changed its analysis strategies in 2015.
These new strategies consist on the release of the BSI every four months, the review of the events with ML ≥
1.5 and the priority on the review of events with ML ≥ 3.5. Furthermore, in the last year we improved the
bulletin tools and made possible the analysis of all the stations whose data are stored in the European Integrated
Data Archive (EIDA). The new procedures and software utilities allowed, during the first month of
2016 emergency, to integrate, in the Bulletin, the temporary stations installed by the emergency group
SISMIKO, both in real–time transmission and in stand-alone recording.
In the early days of the sequence many of the BSI analysts were engaged in the monitoring room shifts,
nevertheless at the end of August all events occurred in those days with ML ≥ 4 were analyzed; the largest
event recovered and localized is a ML = 4.5 event immediately following the main shock.
In September 2016, 83 events with ML ≥ 3.5 were analyzed and re-checked, the number of pickings greatly
improved. The focal mechanism of the main shock was evaluated using first motion polarities, and compared
with the available Time Domain Moment Tensors and Regional Centroid Moment Tensor.
The first eight hours of the day on August 24th, the most critical for the INGV surveillance room, were
carefully analyzed: the number of located events increased from 133 to 408. The magnitude of completeness,
after the analysis of the BSI, has dropped significantly from about 3.5 to 2.7. The mainshock focal
mechanism and the relative locations of the first 8 hours’ aftershocks give clues on the initial fault activation.
The seismic sequence in November 2016 is still ongoing; it included a mainshock of Mw = 6.5 on October
30th and 3 events of magnitude greater than 5.0 one on August 24th and two on October 26th.
References
REFERENCES
Amato, A. and F. M. Mele (2008). Performance
of the INGV National Seismic
Network from 1997 to 2007. Annals of
Geophysics. doi: 10.4401/ag-4454.
Bollettino Sismico Italiano
2016, doi:10.13127/BOLLETTINO/ 2016.01
2015,doi:10.13127/BOLLETTINO/2015.01
2015, doi:10.13127/BOLLETTINO/2015.0
2015,doi:10.13127/BOLLETTINO/2015.03
EMERGEO Working Group (2016). The 24
August 2016 Amatrice Earthquake: Coseismic
Effects. Doi:10.5281/zenodo.61568
EMERSITO Working Group (2016). Rapporto
preliminare sulle attività svolte dal gruppo
EMERSITO a seguito del terremoto di
Amatrice Mw 6.0 (24 agosto 2016, Italia
centrale). Doi:10.5281/zenodo.61884.
Gruppo di Lavoro INGV sul terremoto di
Amatrice (2016). Secondo rapporto di sintesi
sul Terremoto di Amatrice Ml 6.0 del
24 Agosto 2016 (Italia Centrale). Doi:
10.5281/zenodo.154400.
Lahr J.C. (1989). HYPOELLIPSE/version
2.00: a computer program for determining
local earthquakes hypocentral parameters,
magnitude and first motion pattern.
U.S. Geol. Surv. Open-File Rep., 89-
116, 92 pp.
Mazza, S., A. Basili, A. Bono, V. Lauciani,
A.G. Mandiello, C. Marcocci, F.M. Mele,
S. Pintore, M. Quintiliani, L. Scognamiglio
and G. Selvaggi (2012). EIDA – Seismic
data acquisition, processing, storage
and distribution at the National Earthquake
Center, INGV. Annals of Geophysics,
55 (4); doi:10.4401/ag-6145.
Moretti M., Cattaneo C., Cecere G., Govoni
A., Margheriti L. and S. Mazza (2014). Integrazione
dei dati sismologici delle reti
sismiche permanenti e temporanee. Regolamento
e procedure. Rapporti Tecnici
INGV, 276.
Moretti and SISMIKO Working Group
(2016). Sismiko: emergency network deployment
and data sharing for the 2016
Amatrice seismic sequence. This volume
Nardi A., et al. (2015). Bollettino Sismico Italiano:
novità. 34° GNGTS. Trieste, novembre
2015.
Reasenberg, P. and D. Oppenheimer (1985).
FPFIT, FPPLOT and FPPAGE: FORTRAN
computer programs for calculating and
displying earthquake fault-plane solutions,
U.S. Geol. Surv. O.File Rep. 85-739.
Pintore et al. (2016). INGV data lifecycle
management system, performances during
Mw 6.0 2016 Amatrice Earthquake
Sequence. This volume.
Pondrelli S., et al. (2016). Pianificazione e gestione
di un’emergenza sismica: esercitazione
INGV del 26 novembre 2015 effettuata
nell’ambito della Linea di Attività
T5 “Sorveglianza sismica e operatività
post terremoto”. Quaderni di Geofisica.
Waldhauser, F. and W. L. Ellsworth (2000). A
double-difference earthquake location algorithm:
Method and application to the
northern Hayward fault, California,
BSSA, 90, 1353-1368, 2000.
Woessner, J., and S. Wiemer (2005). Assessing
the quality of earthquake catalogues:
Estimating the magnitude of
completeness and its uncertainty Bulletin
of the Seismological Society of America
95 (2), 684-698, 2005.
Amato, A. and F. M. Mele (2008). Performance
of the INGV National Seismic
Network from 1997 to 2007. Annals of
Geophysics. doi: 10.4401/ag-4454.
Bollettino Sismico Italiano
2016, doi:10.13127/BOLLETTINO/ 2016.01
2015,doi:10.13127/BOLLETTINO/2015.01
2015, doi:10.13127/BOLLETTINO/2015.0
2015,doi:10.13127/BOLLETTINO/2015.03
EMERGEO Working Group (2016). The 24
August 2016 Amatrice Earthquake: Coseismic
Effects. Doi:10.5281/zenodo.61568
EMERSITO Working Group (2016). Rapporto
preliminare sulle attività svolte dal gruppo
EMERSITO a seguito del terremoto di
Amatrice Mw 6.0 (24 agosto 2016, Italia
centrale). Doi:10.5281/zenodo.61884.
Gruppo di Lavoro INGV sul terremoto di
Amatrice (2016). Secondo rapporto di sintesi
sul Terremoto di Amatrice Ml 6.0 del
24 Agosto 2016 (Italia Centrale). Doi:
10.5281/zenodo.154400.
Lahr J.C. (1989). HYPOELLIPSE/version
2.00: a computer program for determining
local earthquakes hypocentral parameters,
magnitude and first motion pattern.
U.S. Geol. Surv. Open-File Rep., 89-
116, 92 pp.
Mazza, S., A. Basili, A. Bono, V. Lauciani,
A.G. Mandiello, C. Marcocci, F.M. Mele,
S. Pintore, M. Quintiliani, L. Scognamiglio
and G. Selvaggi (2012). EIDA – Seismic
data acquisition, processing, storage
and distribution at the National Earthquake
Center, INGV. Annals of Geophysics,
55 (4); doi:10.4401/ag-6145.
Moretti M., Cattaneo C., Cecere G., Govoni
A., Margheriti L. and S. Mazza (2014). Integrazione
dei dati sismologici delle reti
sismiche permanenti e temporanee. Regolamento
e procedure. Rapporti Tecnici
INGV, 276.
Moretti and SISMIKO Working Group
(2016). Sismiko: emergency network deployment
and data sharing for the 2016
Amatrice seismic sequence. This volume
Nardi A., et al. (2015). Bollettino Sismico Italiano:
novità. 34° GNGTS. Trieste, novembre
2015.
Reasenberg, P. and D. Oppenheimer (1985).
FPFIT, FPPLOT and FPPAGE: FORTRAN
computer programs for calculating and
displying earthquake fault-plane solutions,
U.S. Geol. Surv. O.File Rep. 85-739.
Pintore et al. (2016). INGV data lifecycle
management system, performances during
Mw 6.0 2016 Amatrice Earthquake
Sequence. This volume.
Pondrelli S., et al. (2016). Pianificazione e gestione
di un’emergenza sismica: esercitazione
INGV del 26 novembre 2015 effettuata
nell’ambito della Linea di Attività
T5 “Sorveglianza sismica e operatività
post terremoto”. Quaderni di Geofisica.
Waldhauser, F. and W. L. Ellsworth (2000). A
double-difference earthquake location algorithm:
Method and application to the
northern Hayward fault, California,
BSSA, 90, 1353-1368, 2000.
Woessner, J., and S. Wiemer (2005). Assessing
the quality of earthquake catalogues:
Estimating the magnitude of
completeness and its uncertainty Bulletin
of the Seismological Society of America
95 (2), 684-698, 2005.
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