Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 23-10-2021 and time 09:31:50 (UTC) in region 5 km SE Bagnoli Irpino (AV)

A magnitude ML 1.1 earthquake occured in region: 5 km SE Bagnoli Irpino (AV), on

  • 23-10-2021 09:31:50 (UTC)
  • 23-10-2021 11:31:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.7970, 15.0960 at 3 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Bagnoli Irpino AV 5 3217 3217
Acerno SA 7 2783 6000
Montella AV 8 7780 13780
Nusco AV 10 4203 17983
Cassano Irpino AV 10 982 18965
Calabritto AV 11 2391 21356
Senerchia AV 11 842 22198
Caposele AV 11 3483 25681
Lioni AV 12 6201 31882
Campagna SA 15 16703 48585
Teora AV 15 1537 50122
Montecorvino Rovella SA 15 12739 62861
Giffoni Valle Piana SA 16 12001 74862
Castelfranci AV 16 2041 76903
Valva SA 16 1643 78546
Sant'Angelo dei Lombardi AV 16 4250 82796
Montemarano AV 16 2851 85647
Torella dei Lombardi AV 16 2144 87791
Oliveto Citra SA 17 3802 91593
Olevano sul Tusciano SA 17 6878 98471
Castelvetere sul Calore AV 18 1615 100086
Volturara Irpina AV 18 3289 103375
Laviano SA 18 1438 104813
Rocca San Felice AV 18 851 105664
Giffoni Sei Casali SA 18 5264 110928
Colliano SA 18 3638 114566
Morra De Sanctis AV 19 1297 115863
Santomenna SA 19 443 116306
Castelnuovo di Conza SA 19 619 116925
Montecorvino Pugliano SA 19 10701 127626
Villamaina AV 20 995 128621
Serino AV 20 7034 135655
Guardia Lombardi AV 20 1718 137373

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NE of Battipaglia (50786 inhabitants)
28 Km E of Avellino (54857 inhabitants)
31 Km E of Salerno (135261 inhabitants)
35 Km E of Cava de' Tirreni (53659 inhabitants)
46 Km SE of Benevento (60091 inhabitants)
48 Km E of Scafati (50787 inhabitants)
53 Km E of Castellammare di Stabia (66466 inhabitants)
61 Km E of Torre del Greco (86275 inhabitants)
62 Km W of Potenza (67122 inhabitants)
62 Km E of Portici (55274 inhabitants)
63 Km E of Acerra (59573 inhabitants)
63 Km E of Ercolano (53709 inhabitants)
68 Km E of Afragola (65057 inhabitants)
69 Km E of Casoria (77642 inhabitants)
71 Km E of Caserta (76326 inhabitants)
71 Km E of Napoli (974074 inhabitants)
77 Km E of Giugliano in Campania (122974 inhabitants)
77 Km E of Marano di Napoli (59874 inhabitants)
77 Km E of Aversa (53047 inhabitants)
83 Km SW of Foggia (151991 inhabitants)
85 Km E of Pozzuoli (81661 inhabitants)
86 Km SW of Cerignola (58396 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
Rev100 		ML 1.1 2021-10-23
09:31:50		 40.797 15.0962 3 2021-10-23
09:57:03		 Sala Sismica INGV-Roma 96905711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 09:31:50 ± 0.22
Latitude 40.7970 ± 0.0054
Longitude 15.0962 ± 0.0190
Depth (km) 3 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96905711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1196
Semi-minor axis of confidence ellipse (meter) 1086
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 73
Circular confidence region, given by single value of horizontal uncertainty (meter) 1200.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 197
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.05396
Epicentral distance of station farthest from the epicenter (degree) 0.34534
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96905711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 09:57:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CDRU.HHN. 2021-10-23T09:31:58.26 0.6 undecidable manual P 153 38.3283 95 0.38 45
IX.LIO3.HHZ.02 2021-10-23T09:31:55.22 0.6 undecidable manual S 32 13.1757 104 0.35 47
IX.SNR3.EHZ.02 2021-10-23T09:31:54.47 0.3 undecidable manual S 130 10.5783 107 0.46 69
IX.COL3.HHZ.02 2021-10-23T09:31:54.72 0.6 undecidable manual P 122 23.1546 98 -0.14 48
IV.SNAL.HHZ. 2021-10-23T09:31:53.37 0.6 undecidable manual P 34 17.0718 101 -0.29 47
IX.CMP3.EHZ.02 2021-10-23T09:31:53.29 0.6 undecidable manual P 185 16.1727 101 -0.18 49
IX.SNR3.EHZ.02 2021-10-23T09:31:52.48 0.1 undecidable manual P 130 10.5783 107 0.09 100
IV.MCRV.HHZ. 2021-10-23T09:31:52.25 0.3 undecidable manual S 105 6.2937 117 -0.37 71
IX.NSC3.EHZ.02 2021-10-23T09:31:52.72 0.3 undecidable manual S 22 5.994 118 0.2 74
IX.LIO3.HHZ.02 2021-10-23T09:31:52.75 0.3 undecidable manual P 32 13.1757 104 -0.13 74
IV.MCRV.HHZ. 2021-10-23T09:31:51.24 0.3 undecidable manual P 105 6.2937 117 -0.35 72
IX.NSC3.EHZ.02 2021-10-23T09:31:51.55 0.3 undecidable manual P 22 5.994 118 0.03 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SNAL.HHN. ML:1.0 0.000093262235 0.6784 AML other m 2021-10-23T09:32:00.63
IV.SNAL.HHE. ML:1.0 0.000106866315 0.6976 AML other m 2021-10-23T09:32:00.98
IV.MCRV.HHE. ML:0.0 0.0002423073 0.096 AML other m 2021-10-23T09:31:52.70
IV.MCRV.HHN. ML:0.0 0.00065143975 0.1408 AML other m 2021-10-23T09:31:52.90
IX.NSC3.EHE.02 ML:0.0 0.00023805769999999998 0.2112 AML other m 2021-10-23T09:31:54.32
IX.NSC3.EHN.02 ML:0.0 0.00033893485 0.16 AML other m 2021-10-23T09:31:53.24
IX.SNR3.EHE.02 ML:1.1 0.0002001478 0.1792 AML other m 2021-10-23T09:31:56.30
IX.SNR3.EHN.02 ML:1.3 0.0003358756 0.16 AML other m 2021-10-23T09:31:55.91
IX.SNR3.HNE.01 ML:1.1 0.000207988705 0.1792 AML other m 2021-10-23T09:31:56.31
IX.SNR3.HNN.01 ML:1.3 0.00033968700000000003 0.1472 AML other m 2021-10-23T09:31:55.84
IV.SNAL.HNE. ML:1.1 0.00011853282 0.6784 AML other m 2021-10-23T09:32:00.97
IV.SNAL.HNN. ML:0.9 0.00007517317799999999 0.6784 AML other m 2021-10-23T09:32:00.63
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