INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Md 2.0 on date 19-04-2017 and time 22:18:01 (Italy) in region 5 km SE Massa di Somma (NA)

A magnitude Md 2.0 earthquake occured in region: 5 km SE Massa di Somma (NA), on

  • 19-04-2017 20:18:01 (UTC)
  • 19-04-2017 22:18:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.82, 14.42 at 0 km depth.

The earthquake was located by: Sala Operativa INGV-OV (Napoli).

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Massa di Somma NA 5 5444 5444
San Sebastiano al Vesuvio NA 5 9196 14640
Trecase NA 5 9097 23737
Boscotrecase NA 6 10363 34100
Portici NA 6 55274 89374
Sant'Anastasia NA 6 27671 117045
Pollena Trocchia NA 6 13562 130607
Torre del Greco NA 6 86275 216882
Ottaviano NA 6 23860 240742
Somma Vesuviana NA 6 35233 275975
Ercolano NA 6 53709 329684
Terzigno NA 7 18968 348652
Boscoreale NA 7 28072 376724
Torre Annunziata NA 7 42789 419513
Cercola NA 7 18267 437780
San Giuseppe Vesuviano NA 7 30657 468437
San Giorgio a Cremano NA 8 45557 513994
Volla NA 9 23755 537749
Pompei NA 10 25358 563107
Pomigliano d'Arco NA 10 39922 603029
Poggiomarino NA 10 21976 625005
San Gennaro Vesuviano NA 10 11966 636971
Castello di Cisterna NA 11 7869 644840
Brusciano NA 12 16466 661306
Scafati SA 12 50787 712093
Scisciano NA 12 5994 718087
Mariglianella NA 12 7787 725874
Marigliano NA 12 30157 756031
Casalnuovo di Napoli NA 12 49855 805886
Palma Campania NA 13 15978 821864
Saviano NA 13 15982 837846
San Vitaliano NA 13 6461 844307
Striano NA 13 8397 852704
Santa Maria la Carità NA 13 11722 864426
Carbonara di Nola NA 15 2429 866855
Napoli NA 15 974074 1840929
Castellammare di Stabia NA 15 66466 1907395
San Marzano sul Sarno SA 15 10442 1917837
Casoria NA 15 77642 1995479
Sant'Antonio Abate NA 15 19743 2015222
Angri SA 15 34002 2049224
Acerra NA 15 59573 2108797
Afragola NA 15 65057 2173854
Nola NA 15 34431 2208285
San Paolo Bel Sito NA 15 3513 2211798
Casavatore NA 15 18661 2230459
San Valentino Torio SA 15 10947 2241406
Liveri NA 16 1607 2243013
Domicella AV 16 1862 2244875
Lettere NA 16 6188 2251063
Cimitile NA 16 7280 2258343
Casola di Napoli NA 16 3898 2262241
Marzano di Nola AV 16 1727 2263968
Arzano NA 17 34886 2298854
Gragnano NA 17 29136 2327990
Sarno SA 17 31529 2359519
Casamarciano NA 17 3289 2362808
Vico Equense NA 17 20969 2383777
Sant'Egidio del Monte Albino SA 18 8909 2392686
Pimonte NA 18 5980 2398666
Camposano NA 18 5333 2403999
Pago del Vallo di Lauro AV 18 1830 2405829
Corbara SA 18 2545 2408374
Cardito NA 18 22755 2431129
Visciano NA 18 4454 2435583
Comiziano NA 19 1814 2437397
Caivano NA 19 37879 2475276
Frattamaggiore NA 19 30329 2505605
Pagani SA 19 35834 2541439
Crispano NA 19 12354 2553793
Lauro AV 19 3509 2557302
Grumo Nevano NA 19 18061 2575363
Meta NA 19 8015 2583378
Cicciano NA 19 12906 2596284
Casandrino NA 19 14336 2610620
Tufino NA 20 3776 2614396
Taurano AV 20 1546 2615942
Quindici AV 20 1938 2617880
Melito di Napoli NA 20 37826 2655706
Frattaminore NA 20 16208 2671914

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km E of Portici (55274 inhabitants)
6 Km NE of Torre del Greco (86275 inhabitants)
6 Km E of Ercolano (53709 inhabitants)
12 Km NW of Scafati (50787 inhabitants)
15 Km NW of Castellammare di Stabia (66466 inhabitants)
15 Km E of Napoli (974074 inhabitants)
15 Km SE of Casoria (77642 inhabitants)
15 Km S of Acerra (59573 inhabitants)
15 Km SE of Afragola (65057 inhabitants)
21 Km E of Marano di Napoli (59874 inhabitants)
22 Km SE of Giugliano in Campania (122974 inhabitants)
25 Km SE of Aversa (53047 inhabitants)
27 Km W of Cava de' Tirreni (53659 inhabitants)
28 Km E of Pozzuoli (81661 inhabitants)
30 Km S of Caserta (76326 inhabitants)
32 Km W of Salerno (135261 inhabitants)
33 Km W of Avellino (54857 inhabitants)
46 Km SW of Benevento (60091 inhabitants)
53 Km W of Battipaglia (50786 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Date and Time (UTC) Latitude Longitude Magnitude Depth (km) Published time (UTC) Author Location ID
Rev 200 2017-04-19
20:18:01
40.82 14.42 Md 2.0 0 2017-06-07
08:07:42
Sala Operativa INGV-OV (Napoli) 44109661
Best location and best magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-04-19 20:18:01 ± 0
Latitude 40.82
Longitude 14.42
Depth (km) 0 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 200 -> SURVEY-INGV-OV
Event type earthquake
Origin ID 44109661

Uncertainty

Field Value
Preferred uncertainty description
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 1
Number of defining phases 1
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree)
Epicentral distance of station farthest from the epicenter (degree)
Number of stations at which the event was observed 0
Number of stations from which data was used for origin computation 0
Magnitude information

Md:2

Field Value
Value 2
Uncertainty 0
Num. used stations
Type of magnitude Md
Reference to an origin 44109661
Agency INGV
Autore Sala Operativa INGV-OV (Napoli)
Time of creation (UTC) 2017-04-19 21:16:04
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://cnt.rm.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in full SEED format Download