Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 20-09-2021 and time 15:17:20 (Italy) in region 4 km W Calabritto (AV)

A magnitude ML 1.6 earthquake occured in region: 4 km W Calabritto (AV), on

  • 20-09-2021 13:17:20 (UTC)
  • 20-09-2021 15:17:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.8010, 15.1760 at 15 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.

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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
Calabritto AV 4 2391 2391
Caposele AV 5 3483 5874
Senerchia AV 7 842 6716
Teora AV 9 1537 8253
Lioni AV 9 6201 14454
Bagnoli Irpino AV 10 3217 17671
Valva SA 10 1643 19314
Laviano SA 11 1438 20752
Acerno SA 12 2783 23535
Santomenna SA 12 443 23978
Nusco AV 12 4203 28181
Castelnuovo di Conza SA 12 619 28800
Colliano SA 13 3638 32438
Oliveto Citra SA 13 3802 36240
Montella AV 14 7780 44020
Sant'Angelo dei Lombardi AV 14 4250 48270
Cassano Irpino AV 15 982 49252
Conza della Campania AV 15 1373 50625
Morra De Sanctis AV 15 1297 51922
Campagna SA 16 16703 68625
Torella dei Lombardi AV 17 2144 70769
Rocca San Felice AV 17 851 71620
Sant'Andrea di Conza AV 17 1539 73159
Guardia Lombardi AV 17 1718 74877
Contursi Terme SA 18 3394 78271
Palomonte SA 18 3985 82256
Castelfranci AV 18 2041 84297
Pescopagano PZ 19 1910 86207
Andretta AV 19 1927 88134
Cairano AV 20 326 88460

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km NE of Battipaglia (50786 inhabitants)
34 Km E of Avellino (54857 inhabitants)
38 Km E of Salerno (135261 inhabitants)
41 Km E of Cava de' Tirreni (53659 inhabitants)
49 Km SE of Benevento (60091 inhabitants)
55 Km E of Scafati (50787 inhabitants)
56 Km W of Potenza (67122 inhabitants)
60 Km E of Castellammare di Stabia (66466 inhabitants)
68 Km E of Torre del Greco (86275 inhabitants)
69 Km E of Portici (55274 inhabitants)
70 Km E of Acerra (59573 inhabitants)
70 Km E of Ercolano (53709 inhabitants)
74 Km E of Afragola (65057 inhabitants)
75 Km E of Casoria (77642 inhabitants)
77 Km E of Caserta (76326 inhabitants)
78 Km E of Napoli (974074 inhabitants)
80 Km SW of Foggia (151991 inhabitants)
80 Km SW of Cerignola (58396 inhabitants)
83 Km E of Giugliano in Campania (122974 inhabitants)
84 Km E of Marano di Napoli (59874 inhabitants)
84 Km E of Aversa (53047 inhabitants)
91 Km E of Pozzuoli (81661 inhabitants)
100 Km S of San Severo (53905 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 1.6 2021-09-20
13:17:20		 40.8008 15.1763 15 2022-03-30
13:04:30		 Bollettino Sismico Italiano INGV 99739791
Reviewed
Rev100 		ML 1.7 2021-09-20
13:17:20		 40.8048 15.2002 14 2021-09-20
13:25:45		 Sala Sismica INGV-Roma 95664511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 13:17:20 ± 0.15
Latitude 40.8008 ± 0.0036
Longitude 15.1763 ± 0.0095
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99739791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 605
Semi-minor axis of confidence ellipse (meter) 595
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 25
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) 0.01889
Epicentral distance of station farthest from the epicenter (degree) 0.32555
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:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 99739791
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-13 12:16:27

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 95664511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 13:25:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CDRU.HNZ. 2021-09-20T13:17:32.40 0.3 undecidable manual S 163 36.1416 99 -0.37 66
IX.RDM3.HHZ.02 2021-09-20T13:17:31.95 0.3 undecidable manual S 75 31.3464 102 0.45 65
IV.SGO.HNZ. 2021-09-20T13:17:31.04 0.3 undecidable manual S 157 28.8489 103 0.18 71
IV.CAFE.HNZ. 2021-09-20T13:17:29.29 0.3 undecidable manual S 11 25.6521 106 -0.75 62
IX.MNT3.EHZ.02 2021-09-20T13:17:27.92 0.3 undecidable manual S 286 14.7741 124 0.54 67
IX.SALI.HNZ.01 2021-09-20T13:17:27.58 0.3 undecidable manual S 1 14.3745 125 0.29 70
IX.RDM3.HHZ.02 2021-09-20T13:17:27.32 0.1 undecidable manual P 75 31.3464 102 0.44 88
IV.SNAL.HHZ. 2021-09-20T13:17:27.36 0.3 undecidable manual S 11 14.0748 126 0.12 73
IV.CDRU.HNZ. 2021-09-20T13:17:27.39 0.3 undecidable manual P 163 36.1416 99 -0.23 68
IX.NSC3.EHZ.02 2021-09-20T13:17:26.00 0.3 undecidable manual S 318 6.7932 150 0.07 75
IX.SNR3.EHZ.02 2021-09-20T13:17:26.37 0.6 undecidable manual S 169 7.3815 148 0.37 72
IX.LIO3.HNZ.02 2021-09-20T13:17:26.16 0.3 undecidable manual S 2 10.6782 136 -0.38 70
IV.SGO.HNZ. 2021-09-20T13:17:26.45 0.6 undecidable manual P 157 28.8489 103 -0.06 48
IV.MCRV.HHZ. 2021-09-20T13:17:25.27 0.3 undecidable manual S 198 2.0979 170 -0.23 72
IX.CLT3.HNZ.02 2021-09-20T13:17:25.54 0.6 undecidable manual P 59 22.2555 110 0.01 49
IV.CAFE.HNZ. 2021-09-20T13:17:25.92 0.3 undecidable manual P 11 25.6521 106 -0.12 72
IX.CMP3.HNZ.02 2021-09-20T13:17:25.29 1.0 undecidable manual P 206 18.3705 116 0.3 24
IV.SNAL.HHZ. 2021-09-20T13:17:24.22 0.1 undecidable manual P 11 14.0748 126 -0.2 97
IX.MNT3.EHZ.02 2021-09-20T13:17:24.68 0.1 positive manual P 286 14.7741 124 0.17 97
IX.COL3.HHZ.02 2021-09-20T13:17:24.91 0.6 undecidable manual P 134 18.0708 117 -0.03 49
IX.SALI.HNZ.01 2021-09-20T13:17:24.37 0.1 undecidable manual P 1 14.3745 125 -0.08 99
IX.LIO3.HNZ.02 2021-09-20T13:17:23.82 0.1 undecidable manual P 2 10.6782 136 -0.2 97
IV.MCRV.HHZ. 2021-09-20T13:17:23.34 0.1 undecidable manual P 198 2.0979 170 -0.08 100
IX.NSC3.EHZ.02 2021-09-20T13:17:23.60 0.1 negative manual P 318 6.7932 150 -0.06 100
IX.SNR3.EHZ.02 2021-09-20T13:17:23.80 0.1 negative manual P 169 7.3815 148 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCRV.HHE. ML:1.5 0.00038496155 0.1152 AML other m 2021-09-20T13:17:26.23
IX.NSC3.EHE.02 ML:1.4 0.00029815995 0.128 AML other m 2021-09-20T13:17:26.63
IV.MCRV.HHN. ML:1.9 0.00102565 0.1344 AML other m 2021-09-20T13:17:25.35
IX.NSC3.EHN.02 ML:1.6 0.000441 0.1 AML other m 2021-09-20T13:17:26.80
IX.SNR3.HNN.01 ML:2.0 0.000968849 0.16 AML other m 2021-09-20T13:17:27.32
IX.SNR3.EHN.02 ML:1.9 0.0009044101 0.16 AML other m 2021-09-20T13:17:27.32
IV.SNAL.HHN. ML:1.6 0.00030648495 0.1792 AML other m 2021-09-20T13:17:27.78
IV.SNAL.HNN. ML:1.5 0.0002860584 0.1984 AML other m 2021-09-20T13:17:27.78
IX.SNR3.EHE.02 ML:1.7 0.0005669999999999999 0.28 AML other m 2021-09-20T13:17:28.00
IX.SNR3.HNE.01 ML:1.6 0.00040207085 0.16 AML other m 2021-09-20T13:17:27.05
IV.SNAL.HHE. ML:1.3 0.00015254758000000002 0.1984 AML other m 2021-09-20T13:17:28.26
IV.SNAL.HNE. ML:1.2 0.00014041680500000001 0.1984 AML other m 2021-09-20T13:17:29.03
IX.MNT3.EHN.02 ML:1.8 0.0004884988499999999 0.096 AML other m 2021-09-20T13:17:28.78
IX.MNT3.EHE.02 ML:1.4 0.00021063325 0.128 AML other m 2021-09-20T13:17:28.41
IX.MNT3.HNE.01 ML:1.4 0.0001877054 0.1088 AML other m 2021-09-20T13:17:28.46
IX.MNT3.HNN.01 ML:1.7 0.00043678744999999994 0.0768 AML other m 2021-09-20T13:17:28.73
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