Electronic Supplement to
The ShakeMap Atlas for the city of Naples, Italy

by Licia Faenza, Simona Pierdominici, Romano Camassi, Alberto Michelini, Emanuela Ercolani, and Valentino Lauciani

Results for the Statistical Completeness Estimates

The Electronic Supplement consists of: i) the tables with the parametric information of the felt earthquakes in Naples for the three macroseismic database analyzed; ii) the analysis for the historical completeness; iii) the overview of the geological settings of Naples; iv) the Ground ShakeMap for the 84 earthquakes with Is greater than 4 in Naples.

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Tables

Tables are comma-separated value plain text files.

Table S1. List of the 61 events derived from the Database Macrosismico Italiano (DBMI11, Locati et al., 2010), with intensity at site (IS) greater than or equal to 4 at Naples. The table lists: Date, Time, Epicentral area, Intensity in Naples (IS), Epicentral Intensity (I0), Moment Magnitude (Mw), number of MCS data points (DBMI11), number of strong motion records (ITACA, Luzi et al., 2008); Locations are from the Catalogo Parametrico dei Terremoti Italiani (CPTI11, Rovida et al., 2011).

Table S2. List of the 10 events derived from the database "Materials for an Italian earthquake catalog: unknown, reappraised or rediscovered events" (CAMAL11, Camassi et. al., 2011), with intensity at site (IS) greater than or equal to 4 at Naples. The table lists: Date, Time, Epicentral area, Intensity in Naples (IS), Epicentral Intensity (I0), Moment Magnitude (Mw), number of MCS data point (CAMAL11), number of strong motion records (ITACA, Luzi et al., 2008); Locations and magnitude are calculated for this study.

Table S3. List of the 13 events derived from the database "Materials for the catalogues of Italian earthquakes: a reappraisal of minor seismicity" (MOLAL08, Molin et al., 2008), with intensity at site (IS) greater than or equal to 4 at Naples. The table lists: Date, Time, Epicentral area, Intensity in Naples (IS), Epicentral Intensity (I0), Moment Magnitude (Mw), number of MCS data points (MOLAL08), number of strong motion records (ITACA, Luzi et al., 2008); Locations are from MOLAL08

Table S4. Results for Is ≥ 7.5 from historical completeness. The table lists the epicentral information about the earthquake, a column to identify if the observed intensity at the city of Naples (Iso) is greater than or equal to 7.5; a column to identify if Iso is less than 7.5; a column to identify if the calculated intensity (Isc) is greater than or equal to 7.5; a column to identify if the Isc is less than 7.5; a column to see if Iso is missing (i.e., Isc is greater than 7.5 but no information on Iso is available).

Table S5. Results for Is ≥ 6 for the historical completeness analysis. The table lists the epicentral information about the earthquake, a column to identify if the observed intensity at the city of Naples (Iso) is greater than or equal to 6; a column to identify if Iso is less than 6; a column to identify if the calculated intensity (Isc) is greater than or equal to 6; a column to identify if Isc is less then 6; and a column to see if Iso is missing (i.e., Isc is greater than 6 but no information on Iso is available).

Table S6. Results for Is ≥ 4 from historical completeness analysis. The table lists the epicentral information about the earthquake, a column to identify if the observed intensity at the city of Naples (Iso) is greater than or less to 4; a column to identify if Iso is less than 4; a column to identify if the calculated intensity (Isc) is greater than or equal to 4; a column to identify if Isc is less than 4; and a column to see if Iso is missing (i.e., Isc is greater than 4 but no information on Iso is available).

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Geological Setting

To provide reliable maps of ground shaking from all those seismic events that have been felt in the city of Naples it is relevant to know the underground deposit in the Naples area. The volcanic deposits in the city of Naples result from different eruptive events (Vesuvius, Campi Flegrei, Ischia island volcanoes) and the geomechanical characteristics of these deposits can produce local amplifications of the ground shaking. The city of Naples is surrounded by the Campana plain to the north; by the Vesuvius volcano to the east; by the Tyrrhenian Sea to the south and by the Campi Flegrei caldera and Ischia island to the west (Figure S1). In the western and northern part of the city, the Ignimbrite Campana deposits (37ky) and Neapolitan Yellow Tuff (15ky) are prevalent and associated with the eruptive phases of the Campi Flegrei. To the east, the tuff deposits of the Vesuvius volcano and a few outcrops of soil and washing deposits are the outcropping lithologies (Figure 1). The subsurface geological setting has been reconstructed from geotechnical and stratigraphic data (AA. VV., 1967; AGIP, 1987; Comune di Napoli, 1994). On the basis of these data, Nunziata et al. (2004) identified six zones characterized by homogeneous geological deposits (Figure S1). In the following, the description of the lithologies of Figure S1 is provided:

• Piroclastic deposits of Campi Flegrei (brown color): the Ignimbrite Campana deposit and Neapolitan Yellow Tuff have been grouped in this cluster. a) The Ignimbrite Campana deposit is linked to more explosive eruption occurred in the Campania area (39,000 years B.P.) and covers an area of 7,000 km2. These deposits are characterized essentially from unconsolidated or less consolidated pyroclastic flows of ash with embedded layers of pumice and trachytic to trachiphonolitic scoriae (DiGirolamo et al., 1984; Barberi et al., 1978; Rosi and Sbrana, 1987; Lirer et al., 1987; Scandone et al., 1991; Fisher et al., 1993; Rosi et al., 1996, 1999; Civetta et al., 1997; De Vivo et al., 2001; Fedele et al., 2002, 2003; Pappalardo et al., 2002). b) The Neapolitan Yellow Tuff was the volcanic material resulting from a huge eruption about 15,000 years B.P in the Campi Flegrei area, west of Naples (Orsi et al., 1992, 1995, 2004; Scarpati et al., 1993; Wohletz et al., 1995; Deino et al., 2004) covering approximately 500 km2 with an estimated volume of ca. 30 km3 (Orsi et al., 1992). The Neapolitan Yellow Tuff is an inhomogeneous deposit with a vesicular feature containing small cavities, pumices obsidian fragments, crystals and lithia embedded in an ashy matrix (Vanorio et al., 2002; De Gennaro et al., 1996) making a brittle material characterized by low values of bulk density, compressive strength, and a quite high porosity ranging between 40 % and more than 60 %, which affects its durability (Ottaviani, 1988; Evangelista, 1980; Pellegrino, 1967; Nicotera and Lucini, 1967).
• Tuff deposits of Vesuvius (bordeaux color): these deposits, which mantled the neighboring areas, are mainly characterized by lava effusions and large pyroclastic flows and surges (Santacroce, 1987). They are linked to the effusive and explosive eruptions of Vesuvius at least in the last 39kyr.
• Soil and washing pyroclastic deposits of volcanoes (green color).
• Offshore deposits and waterhead (light blue color).

Figure S2 shows the 6 zones of the microzonation of Naples (Nunziata et al., 2004). Here we provide a concise description of the zones; we refer to the papers of Nunziata et al. (Nunziata et al., 2000; Nunziata, 2004; Nunziata et al., 2004; Nunziata, 2007) for more detail. Zone 1: a thick layer of recent pyroclastic deposits (less then 12,000 years), underlain by marine sand or more seldom by Neapolitan Yellow Tuff. Zone 2: a thick cover of recent pyroclastic deposits and filling material overlying Neapolitan Yellow Tuff formation. The latter is generally 15 m below surface and rarely at depths less than 5 m or more than 20 m. North and eastern part of Naples: Zone 3: this zone has been subdivided into a northern (zone 3N) and southeast part (zone 3S). In the first one, a cover of Neapolitan Yellow Tuff pozzolana and Campanian Ignimbrite deposits on an ancient tuff horizon located at 40 m depth; in zone 3S Vesuvius tuff, both soil and lithoid facies, are prevalent. Zone 4 in the center and southern part of Naples which until the last century this area was below sea level and, consequently, the near surface deposits consists of marine sands on Neapolitan Yellow Tuff deposits (soil and lithoid facies) at 30 m depth. The Neapolitan Yellow Tuff deposits deepens on the southeastern side of Naples. Zone 5: this zone includes the historical center of Naples where a thick cover (up to 20 m of thickness) of man-made deposits and pyroclastic soil (pozzolana) are prevalent and overlying a Neapolitan Yellow Tuff formation in which several cavities are present (Nunziata and Panza, 2002). Zone 6: after the 1980 earthquake this area has been studied in detail. In the past this area was a marsh recently drained for urban development and for the reduction of the flooding risks. The underground formations here are characterized by significant lateral variations and are mainly formed by man-made deposits, alluvial soil (sands, peat and ashes), unconsolidated or less consolidated pozzolana, Napolitan Yellow Tuff and marine sands (Nunziata et al., 2000).

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Figures

Figure S1. Geological sketch of the study area (dashed line). The outcropping deposits have been grouped in three clusters: piroclastic deposits of Campi Flegrei (Ignimbrite Campana deposits and Neapolitan Yellow Tuff), tuff deposits of Vesuvius and soil and washing piroclastic deposits. For our ground shaking analyses also the water and deposits of Tyrrhenian Sea have been taken into account.

Figure S2. The subsurface geological map. Six zones have been identified,characterized by homogeneous geological deposits Nunziata et al. (2004).

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ShakeMap Atlas

Eighty-four ground shaking maps for the earthquakes with Is greater than 4 at Naples. The maps are provided in MCS intensity scale, and Peak Ground Acceleration (%g) for the 16th, 50th and 84th percentile.

1293-09-04 Earthquake	1349-09-09 Earthquake	1386-03-17 Earthquake
1406-09-16 Earthquake	1456-12-05 Earthquake	1457-01-08 Earthquake
1457-02-10 Earthquake	1466-01-15 Earthquake	1505-05-18 Earthquake
1517-03-29 Earthquake	1561-07-31 Earthquake	1561-08-19 Earthquake
1570-04-30 Earthquake	1570-06-17 Earthquake	1575-06-05 Earthquake
1601-08-10 Earthquake	1627-07-30 Earthquake	1631-12-00 Earthquake
1646-05-31 Earthquake	1654-07-24 Earthquake	1657-01-29 Earthquake
1685-05-00 Earthquake	1687-04-25 Earthquake	1688-06-05 Earthquake
1692-03-04 Earthquake	1694-09-08 Earthquake	1694-10-07 Earthquake
1702-03-13 Earthquake	1702-03-14 Earthquake	1706-11-03 Earthquake
1731-03-20 Earthquake	1731-10-17 Earthquake	1732-11-29 Earthquake
1735-01-26 Earthquake	1737-03-31 Earthquake	1739-02-27 Earthquake
1741-08-06 Earthquake	1742-08-17 Earthquake	1743-02-20 Earthquake
1756-10-22 Earthquake	1760-12-23 Earthquake	1761-01-04 Earthquake
1779-10-01 Earthquake	1782-01-11 Earthquake	1783-03-28 Earthquake
1794-06-12 Earthquake	1794-06-15 Earthquake	1805-07-26 Earthquake
1821-08-02 Earthquake	1826-02-01 Earthquake	1826-10-26 Earthquake
1836-11-20 Earthquake	1841-02-21 Earthquake	1846-08-08 Earthquake
1851-08-14 Earthquake	1853-04-09 Earthquake	1857-12-16 Earthquake
1858-03-07 Earthquake	1858-03-08 Earthquake	1861-12-09 Earthquake
1874-12-06 Earthquake	1875-12-06 Earthquake	1882-06-06 Earthquake
1883-07-28 Earthquake	1903-05-04 Earthquake	1905-03-14 Earthquake
1905-08-25 Earthquake	1910-06-07 Earthquake	1913-10-04 Earthquake
1915-01-13 Earthquake	1916-07-03 Earthquake	1927-05-25 Earthquake
1930-04-27 Earthquake	1930-07-23 Earthquake	1962-08-21 Earthquake
1971-05-06 Earthquake	1971-11-29 Earthquake	1975-06-19 Earthquake
1979-09-19 Earthquake	1980-11-23 Earthquake	1980-12-03 Earthquake
1981-02-14 Earthquake	1984-05-07 Earthquake	1999-10-09 Earthquake

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