Earthquake with magnitude of Md 1.0 on date 21-09-2023 and time 20:46:37 (UTC) in region Campi Flegrei

A magnitude Md 1.0 earthquake occured in region: Campi Flegrei, on

  • 21-09-2023 20:46:37 (UTC)
  • 21-09-2023 22:46:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.8170, 14.1580 at 3 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
Pozzuoli NA 7 81661 81661
Quarto NA 7 40930 122591
Bacoli NA 7 26560 149151
Napoli NA 8 974074 1123225
Monte di Procida NA 9 12886 1136111
Marano di Napoli NA 10 59874 1195985
Calvizzano NA 11 12329 1208314
Mugnano di Napoli NA 11 34828 1243142
Qualiano NA 12 25702 1268844
Villaricca NA 12 31122 1299966
Procida NA 13 10530 1310496
Giugliano in Campania NA 13 122974 1433470
Melito di Napoli NA 14 37826 1471296
Casavatore NA 14 18661 1489957
Arzano NA 14 34886 1524843
Sant'Antimo NA 15 33905 1558748
San Giorgio a Cremano NA 15 45557 1604305
Casoria NA 15 77642 1681947
Casandrino NA 16 14336 1696283
Parete CE 16 11442 1707725
Ercolano NA 16 53709 1761434
Grumo Nevano NA 16 18061 1779495
Portici NA 17 55274 1834769
Frattamaggiore NA 17 30329 1865098
Lusciano CE 17 15362 1880460
Volla NA 17 23755 1904215
Afragola NA 17 65057 1969272
Cesa CE 17 8841 1978113
Cercola NA 18 18267 1996380
Sant'Arpino CE 18 14307 2010687
Trentola-Ducenta CE 18 19429 2030116
Torre del Greco NA 18 86275 2116391
Aversa CE 18 53047 2169438
Frattaminore NA 18 16208 2185646
San Sebastiano al Vesuvio NA 18 9196 2194842
Succivo CE 18 8457 2203299
Crispano NA 19 12354 2215653
Cardito NA 19 22755 2238408
Massa di Somma NA 19 5444 2243852
San Marcellino CE 19 14155 2258007
Orta di Atella CE 19 27191 2285198
Pollena Trocchia NA 19 13562 2298760
Casapesenna CE 19 6987 2305747
Gricignano di Aversa CE 19 11881 2317628
Casalnuovo di Napoli NA 20 49855 2367483
Carinaro CE 20 7181 2374664
Caivano NA 20 37879 2412543
Frignano CE 20 9008 2421551

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km SE of Pozzuoli (81661 inhabitants)
8 Km W of Napoli (974074 inhabitants)
10 Km S of Marano di Napoli (59874 inhabitants)
13 Km S of Giugliano in Campania (122974 inhabitants)
15 Km SW of Casoria (77642 inhabitants)
16 Km W of Ercolano (53709 inhabitants)
17 Km W of Portici (55274 inhabitants)
17 Km SW of Afragola (65057 inhabitants)
18 Km W of Torre del Greco (86275 inhabitants)
18 Km S of Aversa (53047 inhabitants)
23 Km SW of Acerra (59573 inhabitants)
30 Km W of Castellammare di Stabia (66466 inhabitants)
32 Km W of Scafati (50787 inhabitants)
32 Km SW of Caserta (76326 inhabitants)
48 Km W of Cava de' Tirreni (53659 inhabitants)
53 Km W of Salerno (135261 inhabitants)
55 Km W of Avellino (54857 inhabitants)
63 Km SW of Benevento (60091 inhabitants)
73 Km W of Battipaglia (50786 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev200
Md 1.0 2023-09-21
20:46:37
40.8173 14.158 3 2023-09-21
20:57:38
Sala Operativa INGV-OV (Napoli) 121322421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 20:46:37
Latitude 40.8173
Longitude 14.1580
Depth (km) 3 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 200 -> SURVEY-INGV-OV#SiSmi
Event type earthquake
Origin ID 121322421

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
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) 200.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
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) 0.04
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:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations
Type of magnitude Md
Reference to an origin 121322421
Agency INGV
Autore Sala Operativa INGV-OV (Napoli)
Time of creation (UTC) 2023-09-21 20:57:38
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download