Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (explosion) with magnitude of ML 1.7 on date 08-07-2021 and time 08:57:08 (UTC) in region Campi Flegrei

A magnitude ML 1.7 (explosion) earthquake occured in region: Campi Flegrei, on

  • 08-07-2021 08:57:08 (UTC)
  • 08-07-2021 10:57:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.7880, 14.1060 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: explosion.

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.

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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
Monte di Procida NA 4 12886 39446
Pozzuoli NA 7 81661 121107
Procida NA 7 10530 131637
Quarto NA 11 40930 172567
Napoli NA 14 974074 1146641
Marano di Napoli NA 14 59874 1206515
Ischia NA 15 19915 1226430
Calvizzano NA 15 12329 1238759
Qualiano NA 15 25702 1264461
Mugnano di Napoli NA 16 34828 1299289
Villaricca NA 17 31122 1330411
Casamicciola Terme NA 17 8362 1338773
Giugliano in Campania NA 18 122974 1461747
Barano d'Ischia NA 18 10113 1471860
Melito di Napoli NA 19 37826 1509686
Lacco Ameno NA 19 4853 1514539
Casavatore NA 19 18661 1533200
Arzano NA 20 34886 1568086
Parete CE 20 11442 1579528
Sant'Antimo NA 20 33905 1613433
Serrara Fontana NA 20 3173 1616606
San Giorgio a Cremano NA 20 45557 1662163

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km S of Pozzuoli (81661 inhabitants)
14 Km W of Napoli (974074 inhabitants)
14 Km SW of Marano di Napoli (59874 inhabitants)
18 Km SW of Giugliano in Campania (122974 inhabitants)
20 Km W of Ercolano (53709 inhabitants)
20 Km SW of Casoria (77642 inhabitants)
21 Km W of Portici (55274 inhabitants)
22 Km W of Torre del Greco (86275 inhabitants)
22 Km SW of Aversa (53047 inhabitants)
23 Km SW of Afragola (65057 inhabitants)
29 Km SW of Acerra (59573 inhabitants)
33 Km W of Castellammare di Stabia (66466 inhabitants)
36 Km W of Scafati (50787 inhabitants)
37 Km SW of Caserta (76326 inhabitants)
52 Km W of Cava de' Tirreni (53659 inhabitants)
56 Km W of Salerno (135261 inhabitants)
60 Km W of Avellino (54857 inhabitants)
68 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 		ML 1.7 2021-07-08
08:57:08		 40.7878 14.1062 1 2021-12-29
11:12:12		 Bollettino Sismico Italiano INGV 92945711
Reviewed
Rev100 		ML 1.7 2021-07-08
08:57:08		 40.7362 14.1075 0 2021-07-08
09:59:11		 Sala Sismica INGV-Roma 92410471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-08 08:57:08 ± 0.18
Latitude 40.7878 ± 0.0045
Longitude 14.1062 ± 0.0048
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type explosion
Origin ID 92945711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 540
Semi-minor axis of confidence ellipse (meter) 290
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 328
Circular confidence region, given by single value of horizontal uncertainty (meter) 540.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 181
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.01619
Epicentral distance of station farthest from the epicenter (degree) 0.51801
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 92945711
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-07-30 00:05:00

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 92410471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-08 09:59:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VENT.EHE. 2021-07-08T08:57:19.44 0.6 undecidable manual P 57.498 -7.59 0
IV.PAOL.HHZ. 2021-07-08T08:57:18.54 0.6 undecidable manual P 47.1195 -9.99 0
IV.VCRE.HHZ. 2021-07-08T08:57:14.25 1.0 undecidable manual P 27.5502 -7.19 0
IV.OVO.HHZ. 2021-07-08T08:57:13.61 0.6 undecidable manual P 24.753 -8.03 0
IV.VBKN.HHN. 2021-07-08T08:57:13.87 1.0 undecidable manual P 27.5502 -7.59 0
IV.IFOR.HHN. 2021-07-08T08:57:13.10 1.0 undecidable manual P 22.755 -7.43 0
IV.VVDG.HHE. 2021-07-08T08:57:13.63 0.1 undecidable manual P 27.1506 -7.67 0
IV.VTIR.HHZ. 2021-07-08T08:57:13.60 0.6 undecidable manual P 26.751 -7.54 0
IV.ICVJ.EHN. 2021-07-08T08:57:12.16 0.6 undecidable manual P 18.3705 -6.02 0
IV.IOCA.HHZ. 2021-07-08T08:57:12.16 0.6 undecidable manual P 17.871 -5.74 0
IV.ICAI.EHZ. 2021-07-08T08:57:11.48 0.1 undecidable manual P 242 13.3755 92 -4 0
IV.CBAC.EHE. 2021-07-08T08:57:10.09 0.1 positive manual P 321 3.0969 99 0.16 97
IV.CPIS.HHZ. 2021-07-08T08:57:10.86 0.1 negative manual P 37 5.6943 95 -0.47 86
IV.CFB3.HHZ. 2021-07-08T08:57:10.26 0.1 undecidable manual P 45 3.2967 99 0.23 96
IV.CSFT.HHZ. 2021-07-08T08:57:10.93 0.3 undecidable manual P 32 5.3946 95 -0.21 71
IV.CPOZ.HHZ. 2021-07-08T08:57:10.49 0.1 positive manual P 16 3.7962 97 0.18 97
IV.CAAM.HHN. 2021-07-08T08:57:10.65 0.1 positive manual P 39 4.5954 96 -0.07 99
IV.CFMN.HHZ. 2021-07-08T08:57:10.69 0.1 positive manual P 348 5.0949 96 -0.31 94
IV.CFB2.HHZ. 2021-07-08T08:57:10.09 0.1 positive manual P 52 2.8971 100 0.25 95
IV.COLB.HHZ. 2021-07-08T08:57:10.55 0.1 positive manual P 45 4.8951 96 -0.31 94
IV.CFB1.HHE. 2021-07-08T08:57:10.24 0.1 positive manual P 27 2.7972 100 0.49 91
IV.CMIS.HHZ. 2021-07-08T08:57:09.20 0.1 positive manual P 233 1.7982 106 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CPIS.HHN. ML:2.9 0.006308585 0.1408 AML other m 2021-07-08T08:57:12.17
IV.CPOZ.HHE. ML:2.6 0.003552249 0.0576 AML other m 2021-07-08T08:57:12.33
IV.CPIS.HHE. ML:2.8 0.005277521500000001 0.1024 AML other m 2021-07-08T08:57:12.55
IV.CPOZ.HHN. ML:2.7 0.0038814085 0.1792 AML other m 2021-07-08T08:57:12.70
IV.VCRE.HHE. ML:2.0 0.00058797855 0.4032 AML other m 2021-07-08T08:57:23.55
IV.VTIR.HHE. ML:1.7 0.0002811803 0.32 AML other m 2021-07-08T08:57:24.37
IV.VTIR.HHN. ML:1.7 0.00029881505 0.2368 AML other m 2021-07-08T08:57:25.43
IV.VCRE.HHN. ML:2.2 0.00083392215 0.3456 AML other m 2021-07-08T08:57:26.09
IV.PAOL.HHE. ML:1.4 0.00007117229 0.32 AML other m 2021-07-08T08:57:30.68
IV.PAOL.HHN. ML:1.6 0.00011139599999999999 0.5376 AML other m 2021-07-08T08:57:34.06
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