Earthquake with magnitude of Md 2.3 on date 21-04-2023 and time 03:11:42 (UTC) in region Campi Flegrei

A magnitude Md 2.3 earthquake occured in region: Campi Flegrei, on

  • 21-04-2023 03:11:42 (UTC)
  • 21-04-2023 05:11:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.8140, 14.1140 at 2 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Bacoli NA 3 26560 26560
Pozzuoli NA 4 81661 108221
Monte di Procida NA 5 12886 121107
Quarto NA 8 40930 162037
Procida NA 9 10530 172567
Marano di Napoli NA 12 59874 232441
Napoli NA 12 974074 1206515
Calvizzano NA 12 12329 1218844
Qualiano NA 12 25702 1244546
Mugnano di Napoli NA 13 34828 1279374
Villaricca NA 14 31122 1310496
Giugliano in Campania NA 15 122974 1433470
Melito di Napoli NA 16 37826 1471296
Parete CE 17 11442 1482738
Ischia NA 17 19915 1502653
Casavatore NA 17 18661 1521314
Sant'Antimo NA 17 33905 1555219
Arzano NA 17 34886 1590105
Casandrino NA 18 14336 1604441
Casoria NA 18 77642 1682083
Grumo Nevano NA 19 18061 1700144
Lusciano CE 19 15362 1715506
San Giorgio a Cremano NA 19 45557 1761063
Trentola-Ducenta CE 19 19429 1780492
Casamicciola Terme NA 19 8362 1788854
Cesa CE 19 8841 1797695
Aversa CE 19 53047 1850742
Frattamaggiore NA 20 30329 1881071
Casapesenna CE 20 6987 1888058
Ercolano NA 20 53709 1941767
San Marcellino CE 20 14155 1955922
Sant'Arpino CE 20 14307 1970229

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km SE of Pozzuoli (81661 inhabitants)
12 Km SW of Marano di Napoli (59874 inhabitants)
12 Km W of Napoli (974074 inhabitants)
15 Km SW of Giugliano in Campania (122974 inhabitants)
18 Km SW of Casoria (77642 inhabitants)
19 Km SW of Aversa (53047 inhabitants)
20 Km W of Ercolano (53709 inhabitants)
20 Km W of Portici (55274 inhabitants)
21 Km SW of Afragola (65057 inhabitants)
22 Km W of Torre del Greco (86275 inhabitants)
26 Km SW of Acerra (59573 inhabitants)
34 Km W of Castellammare di Stabia (66466 inhabitants)
34 Km SW of Caserta (76326 inhabitants)
36 Km W of Scafati (50787 inhabitants)
52 Km W of Cava de' Tirreni (53659 inhabitants)
57 Km W of Salerno (135261 inhabitants)
59 Km W of Avellino (54857 inhabitants)
66 Km SW of Benevento (60091 inhabitants)
77 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
Bulletin
Rev1000
Md 2.3 2023-04-21
03:11:42
40.8145 14.1137 2 2024-03-01
17:18:20
Bollettino Sismico Italiano INGV 125069921
Reviewed
Rev200
Md 1.5 2023-04-21
03:11:43
40.8367 14.1092 3 2024-02-06
12:34:29
Sala Operativa INGV-OV (Napoli) 116562221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-21 03:11:42 ± 0.35
Latitude 40.8145 ± 0.0036
Longitude 14.1137 ± 0.0036
Depth (km) 2 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 125069921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 371
Semi-minor axis of confidence ellipse (meter) 247
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 161
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00809
Epicentral distance of station farthest from the epicenter (degree) 0.04137
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

Md:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations
Type of magnitude Md
Reference to an origin 116562221
Agency INGV
Autore Sala Operativa INGV-OV (Napoli)
Time of creation (UTC) 2023-04-21 03:35:02

Md:2.3

Field Value
Value 2.3
Uncertainty 0.2
Num. used stations 9
Type of magnitude Md
Reference to an origin 125069921
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-06 12:34:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CMIS.HHZ. 2023-04-21T03:11:47.14 0.6 undecidable manual S 207 4.4955 118 -0.59 44
IV.CBAC.HHN. 2023-04-21T03:11:46.34 0.6 undecidable manual S 262 2.7972 131 -0.01 50
IV.CSTH.HNE. 2023-04-21T03:11:46.13 0.6 undecidable manual S 61 3.3966 125 -0.7 42
IV.CNIS.HNN. 2023-04-21T03:11:46.59 0.6 undecidable manual S 114 4.5954 118 -1.15 34
IV.CSOB.HNZ. 2023-04-21T03:11:46.10 0.6 undecidable manual S 63 2.8971 130 -0.31 47
IV.CSFT.HHE. 2023-04-21T03:11:45.90 0.6 undecidable manual S 53 2.6973 132 -0.4 47
IV.CNIS.HNN. 2023-04-21T03:11:45.50 0.1 undecidable manual P 114 4.5954 118 -0.07 100
IV.CFB3.HHZ. 2023-04-21T03:11:45.14 0.1 undecidable manual P 110 1.7982 143 0.72 84
IV.CMIS.HHZ. 2023-04-21T03:11:45.48 0.1 undecidable manual P 207 4.4955 118 -0.08 99
IV.CPOZ.HNZ. 2023-04-21T03:11:45.84 0.3 undecidable manual S 33 0.8991 160 0.57 67
IV.CFMN.HNN. 2023-04-21T03:11:45.59 0.3 undecidable manual S 316 2.7972 131 -0.78 61
IV.CBAC.HHN. 2023-04-21T03:11:45.01 0.1 undecidable manual P 262 2.7972 131 0.22 97
IV.CSTH.HNE. 2023-04-21T03:11:45.00 0.1 undecidable manual P 61 3.3966 125 -0.05 100
IV.CSOB.HNZ. 2023-04-21T03:11:44.96 0.1 undecidable manual P 63 2.8971 130 0.14 98
IV.CSFT.HHE. 2023-04-21T03:11:44.87 0.1 undecidable manual P 53 2.6973 132 0.12 99
IV.CAAM.HHN. 2023-04-21T03:11:44.85 0.1 undecidable manual P 76 2.4975 135 0.2 97
IV.CPOZ.HNZ. 2023-04-21T03:11:44.66 0.1 positive manual P 33 0.8991 160 0.49 92
IV.CFMN.HNN. 2023-04-21T03:11:44.66 0.1 undecidable manual P 316 2.7972 131 -0.13 98
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