Citation:

s41598-017-08192-7

Name: Seismic locations, geochemical variations, attenuation anomalies, geomorphological structures for the 1983-84 unrest at Campi Flegrei caldera
Published: 2017-05-18
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

Published: 2017-05-18 • DOI registered: 2017-06-15

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Abstract:

Despite their importance for eruption forecasting the causes of seismic rupture processes during caldera unrest are still poorly reconstructed from seismic images. Seismic source locations and waveform attenuation analyses of earthquakes in Campi Flegrei area (Southern Italy) during the 1982-1984 unrest have revealed a 4-4.5 km deep NW-SE striking aseismic zone of high attenuation offshore Pozzuoli. The lateral features and principal axis of the attenuation anomaly correspond to the main source of ground uplift during the unrest. The seismic swarms correlate in space and time with fluid injections from a deep hot source, inferred to represent geochemical and temperature variations at Solfatara. These injections struck a high-attenuation 3-4 km deep reservoir of supercritical fluids/foams under Pozzuoli and migrated towards a shallower aseismic deformation source under Solfatara. The reservoir became aseismic for two months just after the main seismic swarm (April 1, 1984) due to a SE-to-NW directed input from the high-attenuation domain, likely a dyke emplacement. The unrest ended after fluids migrated from Pozzuoli to the location of the last caldera eruption (Mt. Nuovo, 1538 AD). The results show that a single source controls the largest monitored seismic, deformation, and geochemical unrest at the caldera.

Coverage:

Latitude: 40.827780 * Longitude: 14.139170

Event(s):

Campi_Flegrei_caldera * Latitude: 40.827780 * Longitude: 14.139170 * Location: Phlegraean Fields, Italy

Comment:

The dataset proposed here is the result of this interdisciplinary study. Inside the zipped folder a readme.txt file explains the meaning of each observation.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator
1	File content	Content		De Siena, Luca
2	File name	File name		De Siena, Luca
3	File format	File format		De Siena, Luca
4	File size	File size	kByte	De Siena, Luca
5	Uniform resource locator/link to file	URL file		De Siena, Luca
6	Description	Description		De Siena, Luca

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

41 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Content	2 File name	3 File format	4 File size [kByte]	5 URL file	6 Description
Original output from NonLinLoc, in HYPO format, 1983	1983_loc3D.txt	zipped txt file	64	1983_loc3D.zip
Original output from NonLinLoc, in HYPO format, 1983	1984_loc3D.txt	zipped txt file	77	1984_loc3D.zip
Excel file used to plot Fig. 2	Anomalia-Geochimica.xlsx	xlsx	37	Anomalia-Geochimica.xlsx
Shape file for the coast and faults, imported in Voxler to produce Figs. 3-5 and Suppl. Figs. 2, 4, and 5	CF_FAULTS.shp	shp	182	CF_FAULTS.shp
Shape file for the coast and faults, imported in Voxler to produce Figs. 3-5 and Suppl. Figs. 2, 4, and 5	CF_COSTA.shp	shp	176	CF_COSTA.shp
Attenuation file: input to plot attenuation tomograms in Figs. 3-5, and Checkerboard/Syntheic anomalies in Figs. S3-4.	Q3D.txt	zipped txt file	2612	Q3D.zip	First three columns are the node coordinates; fourth is the value of the inverse Q; fifth and sixth are input and output of the checkerboard test; seventh and eight of the synthetic anomaly tests.
Hypocenter file, input to draw microearthquakes in Figs. 3-5.	Seismicity_UTM_1983_984.txt	zipped txt file	61	Seismicity_UTM_1983_1984.zip
Readme	Readme.txt	zipped txt file	1	Readme.txt.zip