Nicola Pagliuca - Academia.edu (original) (raw)

Papers by Nicola Pagliuca

EGU General Assembly Conference Abstracts, Apr 1, 2016

The aim of the SLAM (Seismicity of Lazio, Abruzzo and Molise region) project is to provide new in... more The aim of the SLAM (Seismicity of Lazio, Abruzzo and Molise region) project is to provide new insight on the seismotectonic and seismogenesis of a wide portion of central Italy situated between areas affected by recent destructive events such as the 2009, Mw = 6.3, L'Aquila earthquake to the north and the 2002, Mw = 5.8, Molise earthquake to the east. We present new results for the microseismic activity in the Central Apennines, occurred in the period 2009-2013, by analyzing seismogram recordings from two temporary networks of up to 17 stations in combination with data from three networks of permanent stations.

ABSTRAC ABSTRAC As its long historical record shows, the portion of the Central Apennines which e... more ABSTRAC ABSTRAC As its long historical record shows, the portion of the Central Apennines which extends to the Tyrrhenian Sea margin and includes the Avezzano-Sulmona area to the north and the Isernia-Cassino area to the south, is affected by moderate to strong seismicity. In the last millennia three highly energetic events occurred: Venafro 1349, Boiano 1805 and Marsica 1915 with effect as large as I = X-XI Mercalli-Cancani-Sieberg Scale (MCS). More recently the study area was hit by the Val Comino seismic sequence (May 1984, Mw 5.9) at the border between Lazio and Abruzzo. Two passive seismic experiments were carried out in the period between 2009 and 2013: the first one with 4 seismic stations (October 2009-January 2010) deployed in the Marsica-Sora area and the second one with 17 stations (November 2011-October 2013) deployed in the whole Central Apennines study area. These two arrays, together with the 20 stations of the Abruzzo regional seismic network (RSA) and the stations of the Italian seismic network (RSNC), have recorded in the study period 6742 earthquakes with local magnitude (M L) ranging from 0.5 to 4.8. Temporary arrays data were integrated with the data of the two IESN (Italian Experimental Seismic Network) stations of southern Lazio and with those of the 5 stations of the Molise regional seismic network. The data considered in this study were recorded by a total of 74 seismic stations. We re-picked the arrival times of the events recorded by the RSNC and RSA and picked those recorded by the two temporary arrays. Our dataset consists of 39.322 P-and 32.600 S-arrival times. We read also P-wave first motion polarities to compute focal mechanisms. During the study period several seismic sequences occurred. Among these the most important are the Campoli Appennino sequence (September-October 2009) with 1299 events (M L max 3.6) and the Sora sequence with 606 events (M L max 4.8). With this reviewed dataset we computed the best minimum 1-D velocity model for both V p and V s applying the Velest code. We compare and discuss the improved earthquake locations with the known seismogenic structures of the study area. The future planned activities will include the generation of high resolution 3-D tomographic models (V p , V s , Q p , Q s) of the fault systems, the relocation of all the studied seismicity with 3-D velocity models, the computation of the focal mechanisms, a review of the M L and the mapping of b-value. Further studies could be on the temporal behaviour of observable seismic parameters, for instance the change in time of V p /V s during the seismic sequences.

Bollettino Di Geofisica Teorica Ed Applicata, Jun 1, 2009

ABSTRACT Following the January 17, 2002 catastrophic eruption of the Nyiragongo Volcano (Democrat... more ABSTRACT Following the January 17, 2002 catastrophic eruption of the Nyiragongo Volcano (Democratic Republic of Congo) located in the western branch of the East African Rift, a great effort has been devoted to the seismic surveillance of this volcanic area. The 2002 eruption destroyed one/tenth of the city of Goma, leaving more than 100,000 homeless. In order to correctly monitor the seismic activity at Nyiragongo volcano for both scientific and civil defence purposes, the Istituto Nazionale di Geofisica e Vulcanologia in cooperation with GVO (Goma Volcanological Observatory), between November 2003 and May 2004 installed a new telemetered seismic network consisting of seven digital stations. The network is operational and seismic signals are continuously recorded at the GVO. In this study, we focus mainly on two aspects: (1) the deployment, in the field, of this new digital seismic network and the related real-time data acquisition system, and (2) the first results from a preliminary data analysis based on 6-month seismic recordings. Based on the waveforms and spectral analysis, long-period and very long period events (both, tectonic and volcanic-tectonic earthquakes), have been detected. Furthermore, we succeeded in locating more than 100 earthquakes. These results should strongly encourage the use of such a network data for seismotectonic studies of the area.

Data, Nov 26, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

La Fossa volcano on Vulcano island is the type-location for Volcanian eruptions. Last eruption da... more La Fossa volcano on Vulcano island is the type-location for Volcanian eruptions. Last eruption dates back to 1888-’90. Since then, the quiescent state of La Fossa has been affected both by persistent fumarolic activity and by diffuse CO2 degassing either at the crater and in areas on the flanks (Forgia vecchia) at the base (Palizzi) of the cone, but also in inhabited areas of Vulcano porto (Levante beach, Faraglione). Normal quiescence has been punctuated by potential unrest crises mainly characterized by increase in magmatic degassing, in fumarole temperatures and in diffuse CO2 degassing. We have been monitoring the diffuse degassing area of La Fossa crater since 1995 and Palizzi, Levante beach and Vulcano porto zones since 2004.The ongoing crisis started in 2021 and showed a huge unprecedented increase in fumarolic degassing associated to ground deformation and episodic anomalous seismicity. For monitoring purposes, we performed since October 2021 two general surveys at the crate...

Earth and Space Science

Cava dei Selci (CdS) is the main degassing site of the Colli Albani quiescent volcano and since 2... more Cava dei Selci (CdS) is the main degassing site of the Colli Albani quiescent volcano and since 20 years it is the site of geochemical volcano monitoring. Emitted gas consists mostly of CO2 (≥98 vol.%) with minor H2S, and helium isotopes suggest it has a significant magmatic component. The diffuse soil CO2 flux was monitored in the period 2000–2020, with 55 surveys on a target area. The total CO2 output fluctuates from 5.6 to 24.8 t d−1. The soil CO2 flux per unit surface (average 2.323 kg m−2 d−1) is the highest of 15 Italian actively degassing volcanic and geothermal areas. Soil CO2 flux and environmental parameter data collected over 4‐year of continuous monitoring (2004–2008) were analyzed by stochastic Gradient Boosting Trees regression (sGBT), Multiple Linear Regression, and Principal Component Regression. Only sGBT predicts the entire data set and effectively identifies the relationship between soil CO2 flux and environmental parameters. Residuals indicate two anomalous degas...

I parametri dei terremoti registrati dalla Rete Sismica Nazionale Italiana, localizzati nelle sal... more I parametri dei terremoti registrati dalla Rete Sismica Nazionale Italiana, localizzati nelle sale di monitoraggio di Roma, Napoli e Catania, sono immediatamente disponibili sul web, alla pagina http://terremoti.ingv.it/, e nell'Italian Seismological Instrumental and parametric Database (ISIDe working group (2016) version 1.0,

Environmental Geochemistry and Health, 2022

Natural gas hazard was assessed at Cava dei Selci, a residential neighbourhood of Marino (Rome) b... more Natural gas hazard was assessed at Cava dei Selci, a residential neighbourhood of Marino (Rome) by a joint study of gas emissions and related health problems. Here a densely urbanized zone with 4000 residents surrounds a dangerous natural gas discharge where, along the years, dozens of animals were killed by the gas. Gas originates from Colli Albani volcano and consists mostly of CO2 with ~ 1 vol% of H2S. In recent years, several gas-related accidents occurred in the urbanized zone (gas blowouts and road collapses). Some houses were evacuated because of hazardous indoor air gas concentration. Gas hazard was assessed by soil CO2 flux and concentration surveys and indoor and outdoor air CO2 and H2S concentration measurements. Open fields and house gardens release a high quantity of CO2 (32.23 tonnes * day−1). Inside most houses, CO2 air concentration exceeds 0.1 vol%, the acceptable long-term exposure range. In several houses both CO2 and H2S exceed the IDLH level (Immediately Dangero...

Quaderni di geofisica, Jul 1, 2020

Tor Caldara natural reserve hosts the southernmost discharge of endogenous gas of Colli Albani vo... more Tor Caldara natural reserve hosts the southernmost discharge of endogenous gas of Colli Albani volcano (mostly CO2 with a relevant H2S content up to 6.3 vol.%). Gas discharges in zones where past sulfur mining removed the impervious surficial cover (e.g. Miniera Grande and Miniera Piccola) and along tectonic fissures. A structural study of the reserve has shown the presence of two zones with different characteristics: prevailing directions NS and N30° in the northern zone; EW and N60° in the southern one. In MarchJuly 2012 a geochemical study was carried out, including a soil CO2 flux survey and continuous monitoring (from 2 to 11 days) of air concentration of CO2 and H2S in 12 sites of the reserve. Environmental parameters were also monitored. Total diffuse soil flux of endogenous CO2 was estimated to 17.48 ton*day1 from 1,259 measurements over a 0.47 km2 surface, with 6.56 ton*day1 only from Miniera Grande. This is the second highest value of soil CO2 flux at Miniera Grande, after...

I parametri dei terremoti registrati dalla Rete Sismica Nazionale Italiana, localizzati nella sal... more I parametri dei terremoti registrati dalla Rete Sismica Nazionale Italiana, localizzati nella sala di monitoraggio di Roma, sono immediatamente disponibili sul web alla pagina http://cnt.rm.ingv.it/ e nell'Italian Seismological Instrumental and parametric Database (ISIDe working group (2016) version 1.0, DOI: 10.13127/ISIDe). Gli analisti del Bollettino Sismico Italiano (BSI) ricontrollano i parametri dei terremoti ottenuti inserendo pesi e polarità degli arrivi delle onde sismiche e integrando i dati letti in sala con tutti quelli disponibili nel sistema di acquisizione. Dal 1985 i dati del bollettino sono consultabili nel database ISIDe.

35 anaLisi deL boLLettino sismico itaLiano a seguito deL terremoto di amatrice mw 6.0 (24 agosto ... more 35 anaLisi deL boLLettino sismico itaLiano a seguito deL terremoto di amatrice mw 6.0 (24 agosto 2016, itaLia centraLe) M.G. Ciaccio2 e Gruppo di Lavoro Bollettino Sismico Italiano (A. Marchetti1, A. Nardi1, A. Bono1, F.M. Mele1, A. Basili1, A.M. Lombardi2, P. Battelli1, C. Melorio1, B. Castello1, V. Lauciani1, M. Berardi2, A. Lisi2, L. Pizzino2, C. Castellano2, A. Rossi2, L. Arcoraci2, G. Lozzi1, A. Battelli1, C. Thermes1, N. Pagliuca2, G. Modica1, P. Baccheschi1, S. Pintore1, M. Quintiliani1, A. Mandiello1, C. Marcocci1, M. Fares1, D. Cheloni1, A. Frepoli1, D. Latorre1, M. Moretti1, M. Pastori1,2, M. Vallocchia1, A. Govoni1, L. Scognamiglio1, A. Michelini1, S. Mazza1, L. Margheriti1) 1 Istituto Nazionale di Geofisica e Vulcanologia, INGV, Centro Nazionale Terremoti 2 Istituto Nazionale di Geofisica e Vulcanologia, INGV, Sezione Roma 1 Sismologia e Tettonofisica

Scientific Data, 2019

In the original version of the Data Descriptor the surname of author Anne Socquet was misspelled.... more In the original version of the Data Descriptor the surname of author Anne Socquet was misspelled. This has now been corrected in the HTML and PDF versions of the Data Descriptor. Some authors were also not appropriately associated with their affiliations in the HTML version, due to formatting errors made by the publisher. This has now been corrected in the HTML version of the Data Descriptor, the affiliations in the PDF were correct from the time of publication.

Tectonics, 2019

The area of Central Italy around Rome contains natural gas discharging zones and several others w... more The area of Central Italy around Rome contains natural gas discharging zones and several others where quarrying or mining excavation removed the impervious superficial layers allowing a free hazardous discharge to the surface of endogenous gas. These gas manifestations are mostly located above buried structural highs of fractured Mesozoic limestones hosting the main regional aquifer and revealed by gravity anomalies. In the last decades, many gas blowouts occurred in this area, from wells whose depth ranged from 10–15 to 350 m. The main component of the emitted gas is CO2 with minor H2S; only in a blowout offshore of Fiumicino CH4 prevailed. Several animals even of large size and two persons were killed by the emitted gas (mostly by H2S), and nearby houses were evacuated because of dangerous indoor CO2 concentrations. He and CO2‐carbon isotopes suggest that gas has a deep mantle signature, as indicated for Fiumicino gas by N2 isotopic composition and N2/36Ar ratios. Gas rising from ...

Scientific data, Jan 27, 2018

We provide a database of the coseismic geological surface effects following the Mw 6.5 Norcia ear... more We provide a database of the coseismic geological surface effects following the Mw 6.5 Norcia earthquake that hit central Italy on 30 October 2016. This was one of the strongest seismic events to occur in Europe in the past thirty years, causing complex surface ruptures over an area of >400 km. The database originated from the collaboration of several European teams (Open EMERGEO Working Group; about 130 researchers) coordinated by the Istituto Nazionale di Geofisica e Vulcanologia. The observations were collected by performing detailed field surveys in the epicentral region in order to describe the geometry and kinematics of surface faulting, and subsequently of landslides and other secondary coseismic effects. The resulting database consists of homogeneous georeferenced records identifying 7323 observation points, each of which contains 18 numeric and string fields of relevant information. This database will impact future earthquake studies focused on modelling of the seismic p...

A seismic network and related data acquisition system were deployed during the November '03 a... more A seismic network and related data acquisition system were deployed during the November '03 and May '04 missions around Nyiragongo volcano. The aim was the building of a real-time monitoring digital seismic network for scientific and civil protection purposes. It is currently operating and signals are continuously recorded. Hundreds of seismic events were triggered and analyzed. The efficiency of seismic monitoring is maintained by local personnel. The installation of the network was simplified by the availability of well-prepared sites, and by the strong support of the whole personnel of the Goma Volcano Observatory (GVO).