Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 20-10-2021 and time 22:39:35 (Italy) in region 2 km SW Buonalbergo (BN)

A magnitude ML 1.3 earthquake occured in region: 2 km SW Buonalbergo (BN), on

  • 20-10-2021 20:39:35 (UTC)
  • 20-10-2021 22:39:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.2070, 14.9670 at 20 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Buonalbergo BN 2 1730 1730
Casalbore AV 5 1800 3530
Sant'Arcangelo Trimonte BN 5 573 4103
Montecalvo Irpino AV 6 3725 7828
Paduli BN 8 3978 11806
San Giorgio La Molara BN 8 2994 14800
Pago Veiano BN 9 2406 17206
Pietrelcina BN 10 3114 20320
Apice BN 10 5686 26006
Ginestra degli Schiavoni BN 10 476 26482
Molinara BN 11 1618 28100
Bonito AV 12 2448 30548
Ariano Irpino AV 12 22700 53248
San Marco dei Cavoti BN 13 3371 56619
Pesco Sannita BN 13 1972 58591
Melito Irpino AV 14 1920 60511
Montefalcone di Val Fortore BN 14 1525 62036
Castelfranco in Miscano BN 14 916 62952
Reino BN 15 1210 64162
Foiano di Val Fortore BN 16 1410 65572
Fragneto l'Abate BN 16 1049 66621
Grottaminarda AV 17 8137 74758
Calvi BN 17 2682 77440
Benevento BN 18 60091 137531
Fragneto Monforte BN 18 1840 139371
Greci AV 18 691 140062
Savignano Irpino AV 18 1140 141202
Venticano AV 18 2537 143739
Mirabella Eclano AV 18 7684 151423
San Giorgio del Sannio BN 19 10022 161445
Villanova del Battista AV 19 1690 163135
San Nicola Manfredi BN 19 3722 166857
San Martino Sannita BN 19 1230 168087
San Nazzaro BN 20 884 168971
Pietradefusi AV 20 2348 171319

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km E of Benevento (60091 inhabitants)
36 Km NE of Avellino (54857 inhabitants)
55 Km E of Caserta (76326 inhabitants)
56 Km SW of Foggia (151991 inhabitants)
58 Km NE of Acerra (59573 inhabitants)
60 Km NE of Cava de' Tirreni (53659 inhabitants)
61 Km N of Salerno (135261 inhabitants)
63 Km NE of Scafati (50787 inhabitants)
63 Km NE of Afragola (65057 inhabitants)
64 Km SW of San Severo (53905 inhabitants)
66 Km NE of Casoria (77642 inhabitants)
67 Km N of Battipaglia (50786 inhabitants)
67 Km NE of Portici (55274 inhabitants)
68 Km NE of Ercolano (53709 inhabitants)
69 Km NE of Torre del Greco (86275 inhabitants)
69 Km E of Aversa (53047 inhabitants)
70 Km NE of Castellammare di Stabia (66466 inhabitants)
71 Km E of Giugliano in Campania (122974 inhabitants)
73 Km NE of Napoli (974074 inhabitants)
74 Km E of Marano di Napoli (59874 inhabitants)
79 Km W of Cerignola (58396 inhabitants)
84 Km E of Pozzuoli (81661 inhabitants)
92 Km SW of Manfredonia (57279 inhabitants)
95 Km NW of Potenza (67122 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 1.6
ML 1.3 		2021-10-20
20:39:35		 41.2067 14.9672 20 2022-03-30
13:04:37		 Bollettino Sismico Italiano INGV 101052411
Reviewed
Rev100 		Md 1.6
ML 1.2 		2021-10-20
20:39:35		 41.2068 14.9493 17 2021-10-20
20:45:40		 Sala Sismica INGV-Roma 96810151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 20:39:35 ± 0.22
Latitude 41.2067 ± 0.0117
Longitude 14.9672 ± 0.0131
Depth (km) 20 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101052411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1080
Semi-minor axis of confidence ellipse (meter) 1031
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 330
Circular confidence region, given by single value of horizontal uncertainty (meter) 1080.0
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 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.08364
Epicentral distance of station farthest from the epicenter (degree) 0.79860
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 101052411
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 16:01:14

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96810151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 20:45:40

Md:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 3
Type of magnitude Md
Reference to an origin 96810151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 20:45:40

Md:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 3
Type of magnitude Md
Reference to an origin 101052411
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 16:01:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SGRT.HHZ. 2021-10-20T20:39:50.13 0.3 undecidable manual P 46 88.6446 96 -0.19 65
OT.OT07.EHE. 2021-10-20T20:39:48.58 0.3 undecidable manual P 53 77.6667 97 -0.06 68
OT.OT05.EHZ. 2021-10-20T20:39:47.50 0.3 undecidable manual P 46 72.8715 98 -0.41 64
IV.SNAL.HHZ. 2021-10-20T20:39:47.80 0.6 undecidable manual S 147 37.2294 108 -0.13 48
OT.OT04.EHE. 2021-10-20T20:39:47.96 0.3 undecidable manual P 42 76.368 98 -0.49 63
IV.CAFE.HHN. 2021-10-20T20:39:46.20 0.6 undecidable manual S 131 29.9478 114 0.07 50
IV.SGG.HHN. 2021-10-20T20:39:46.39 0.6 undecidable manual P 292 52.9026 102 1.52 27
IX.SSB3.HNE. 2021-10-20T20:39:46.24 0.6 undecidable manual S 123 26.0517 118 1.04 36
IX.LGS3.HNE.01 2021-10-20T20:39:44.56 0.6 undecidable manual S 175 24.4533 120 -0.26 48
IV.PSB1.HHZ. 2021-10-20T20:39:42.16 0.3 undecidable manual S 278 13.1757 141 -0.34 72
IV.SNAL.HHZ. 2021-10-20T20:39:42.23 0.3 undecidable manual P 147 37.2294 108 -0.31 70
IV.VITU.HHE. 2021-10-20T20:39:41.44 0.3 undecidable manual P 265 28.2495 116 0.18 73
IX.LGS3.HNE.01 2021-10-20T20:39:41.16 0.3 undecidable manual P 175 24.4533 120 0.41 70
IV.CAFE.HHN. 2021-10-20T20:39:41.35 0.3 undecidable manual P 131 29.9478 114 -0.15 73
IV.MRB1.HHZ. 2021-10-20T20:39:41.56 0.6 undecidable manual S 180 9.2796 151 -0.35 48
IV.MOCO.HHN. 2021-10-20T20:39:41.17 0.3 undecidable manual P 41 24.1536 121 0.48 69
IV.BIOG.HNZ. 2021-10-20T20:39:40.16 0.1 undecidable manual P 93 13.875 139 0.69 86
IX.SSB3.HNE. 2021-10-20T20:39:40.72 0.3 undecidable manual P 123 26.0517 118 -0.24 72
IV.PSB1.HHZ. 2021-10-20T20:39:39.25 0.1 positive manual P 278 13.1757 141 -0.15 100
IV.MRB1.HHZ. 2021-10-20T20:39:38.82 0.1 negative manual P 180 9.2796 151 -0.24 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PSB1.HHE. ML:1.4 0.000176 0.48 AML other m 2021-10-20T20:39:42.32
IV.PSB1.HHN. ML:1.1 0.0000913 0.72 AML other m 2021-10-20T20:39:42.51
IV.MRB1.HHE. ML:1.6 0.0003015 0.52 AML other m 2021-10-20T20:39:46.41
IV.MRB1.HHN. ML:1.6 0.00028000000000000003 0.52 AML other m 2021-10-20T20:39:46.42
IV.SNAL.HHN. ML:0.8 0.00001846722 1.4624 AML other m 2021-10-20T20:39:47.17
IV.SNAL.HHE. ML:0.8 0.000018540275 0.2304 AML other m 2021-10-20T20:39:50.82
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