Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 20-01-2021 and time 03:58:08 (Italy) in region 4 km E Castel San Lorenzo (SA)

A magnitude ML 1.6 earthquake occured in region: 4 km E Castel San Lorenzo (SA), on

  • 20-01-2021 02:58:08 (UTC)
  • 20-01-2021 03:58:08 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 40.4110, 15.2690 at 14 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
Castel San Lorenzo SA 4 2471 2471
Bellosguardo SA 4 794 3265
Aquara SA 4 1545 4810
Felitto SA 5 1283 6093
Roscigno SA 7 817 6910
Roccadaspide SA 7 7209 14119
Ottati SA 7 618 14737
Magliano Vetere SA 8 695 15432
Monteforte Cilento SA 8 564 15996
Sant'Angelo a Fasanella SA 8 635 16631
Sacco SA 9 492 17123
Castelcivita SA 10 1739 18862
Laurino SA 10 1548 20410
Corleto Monforte SA 10 592 21002
Stio SA 11 872 21874
Valle dell'Angelo SA 11 248 22122
Piaggine SA 12 1311 23433
Campora SA 12 439 23872
Controne SA 12 875 24747
Trentinara SA 14 1646 26393
Giungano SA 14 1280 27673
Gioi SA 14 1278 28951
Cicerale SA 14 1220 30171
Orria SA 15 1089 31260
Albanella SA 15 6513 37773
Capaccio Paestum SA 16 22810 60583
Petina SA 16 1159 61742
Perito SA 16 931 62673
San Rufo SA 17 1754 64427
Postiglione SA 17 2151 66578
Sicignano degli Alburni SA 17 3519 70097
Altavilla Silentina SA 17 7051 77148
Moio della Civitella SA 18 1827 78975
Cannalonga SA 19 1063 80038
Salento SA 19 1977 82015
Prignano Cilento SA 19 1018 83033
San Pietro al Tanagro SA 19 1695 84728
Sant'Arsenio SA 20 2815 87543
Ogliastro Cilento SA 20 2270 89813

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SE of Battipaglia (50786 inhabitants)
52 Km SW of Potenza (67122 inhabitants)
52 Km SE of Salerno (135261 inhabitants)
58 Km SE of Cava de' Tirreni (53659 inhabitants)
69 Km SE of Avellino (54857 inhabitants)
73 Km SE of Scafati (50787 inhabitants)
74 Km E of Castellammare di Stabia (66466 inhabitants)
87 Km SE of Torre del Greco (86275 inhabitants)
90 Km SE of Ercolano (53709 inhabitants)
90 Km SE of Portici (55274 inhabitants)
90 Km SE of Benevento (60091 inhabitants)
96 Km SE of Acerra (59573 inhabitants)
98 Km SE of Napoli (974074 inhabitants)
99 Km SE of Afragola (65057 inhabitants)
99 Km SE of Casoria (77642 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 2021-01-20
02:58:08		 40.4108 15.2692 14 2021-07-12
16:54:56		 Bollettino Sismico Italiano INGV 86684411
Reviewed
Rev100 		ML 1.7 2021-01-20
02:58:08		 40.4052 15.2493 14 2021-01-20
03:05:45		 Sala Sismica INGV-Roma 86388211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-20 02:58:08 ± 0.14
Latitude 40.4108 ± 0.0063
Longitude 15.2692 ± 0.0118
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86684411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 896
Semi-minor axis of confidence ellipse (meter) 517
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 900.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 182
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.08364
Epicentral distance of station farthest from the epicenter (degree) 0.50992
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 16
Type of magnitude ML
Reference to an origin 86388211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-20 03:05:45

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 18
Type of magnitude ML
Reference to an origin 86684411
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-29 13:21:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SIRI.HHZ. 2021-01-20T02:58:26.90 0.3 undecidable manual S 116 56.5989 93 0.66 62
IV.BULG.HNN. 2021-01-20T02:58:21.70 0.6 undecidable manual S 166 38.0286 96 0.41 46
IV.MGR.HHZ. 2021-01-20T02:58:20.90 0.6 undecidable manual S 141 38.7279 96 -0.57 42
IV.SLCN.HHZ. 2021-01-20T02:58:19.90 0.3 undecidable manual S 94 30.8469 98 0.52 68
IT.SLC1.HGN. 2021-01-20T02:58:19.10 0.6 undecidable manual S 94 27.6501 100 0.55 46
IV.SIRI.HHZ. 2021-01-20T02:58:18.57 0.6 undecidable manual P 116 56.5989 93 -0.24 45
IX.PGN3.HHZ.02 2021-01-20T02:58:17.34 0.3 undecidable manual P 68 48.0186 94 -0.14 70
IV.MCRV.HHN. 2021-01-20T02:58:17.04 0.6 undecidable manual P 348 42.1245 95 0.47 44
IV.MCEL.HNZ. 2021-01-20T02:58:17.38 0.3 undecidable manual P 102 46.0206 95 0.2 71
IV.MRLC.HHZ. 2021-01-20T02:58:16.99 0.6 undecidable manual P 26 42.5241 95 0.34 46
IX.TEGI.HNN.01 2021-01-20T02:58:16.80 0.6 undecidable manual S 99 22.8549 104 -0.5 45
IV.MGR.HHZ. 2021-01-20T02:58:15.36 0.3 undecidable manual P 141 38.7279 96 -0.69 61
IV.SGO.HHZ. 2021-01-20T02:58:15.50 0.3 undecidable manual S 11 16.872 114 -0.29 73
IX.STN3.HHZ.02 2021-01-20T02:58:15.28 0.6 undecidable manual P 68 34.8429 97 -0.19 47
IX.MRN3.HNE.01 2021-01-20T02:58:15.39 0.6 undecidable manual P 87 38.9277 96 -0.7 40
IV.BULG.HNN. 2021-01-20T02:58:15.81 0.3 undecidable manual P 166 38.0286 96 -0.14 72
IX.VDP3.HNE.01 2021-01-20T02:58:15.22 0.3 undecidable manual P 50 33.4443 97 -0.03 74
IT.SLC1.HGN. 2021-01-20T02:58:14.52 0.3 undecidable manual P 94 27.6501 100 0.15 74
IV.CMPR.HHZ. 2021-01-20T02:58:14.10 0.6 undecidable manual S 164 10.6782 132 -0.29 49
IX.COL3.HHE.02 2021-01-20T02:58:14.91 0.3 undecidable manual P 10 31.0467 98 0.02 75
IV.SLCN.HHZ. 2021-01-20T02:58:14.83 0.3 undecidable manual P 94 30.8469 98 -0.02 74
IV.CDRU.HHZ. 2021-01-20T02:58:14.00 0.3 undecidable manual S 19 9.2796 137 -0.11 76
IX.TEGI.HNN.01 2021-01-20T02:58:13.49 0.3 undecidable manual P 99 22.8549 104 -0.15 73
IV.SGO.HHZ. 2021-01-20T02:58:12.77 0.3 undecidable manual P 11 16.872 114 0 77
IV.CMPR.HHZ. 2021-01-20T02:58:12.25 0.3 undecidable manual P 164 10.6782 132 0.29 73
IV.CDRU.HHZ. 2021-01-20T02:58:11.98 0.1 undecidable manual P 19 9.2796 137 0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CDRU.HHN. ML:1.7 0.00049609185 0.1408 AML other m 2021-01-20T02:58:14.31
IV.CDRU.HHE. ML:1.8 0.00072547395 0.12 AML other m 2021-01-20T02:58:15.01
IV.CMPR.HHN. ML:1.8 0.00068761775 0.1392 AML other m 2021-01-20T02:58:14.70
IV.CMPR.HHE. ML:2.0 0.00106 0.16 AML other m 2021-01-20T02:58:14.85
IV.SGO.HNN. ML:1.8 0.00049978685 0.1696 AML other m 2021-01-20T02:58:15.64
IV.SGO.HHN. ML:1.8 0.00049518125 0.1792 AML other m 2021-01-20T02:58:15.64
IV.SGO.HHE. ML:1.4 0.0002146917 0.0992 AML other m 2021-01-20T02:58:15.90
IV.SGO.HNE. ML:1.5 0.00025696724999999996 0.1904 AML other m 2021-01-20T02:58:15.72
IV.MGR.HHN. ML:1.5 0.0001031 0.16 AML other m 2021-01-20T02:58:21.71
IX.STN3.HHE.02 ML:3.1 0.0051192975 0.368 AML other m 2021-01-20T02:58:22.70
IX.STN3.HHN.02 ML:3.1 0.0047500865 0.192 AML other m 2021-01-20T02:58:22.00
IV.SLCN.HHE. ML:1.6 0.000201 0.34 AML other m 2021-01-20T02:58:22.68
IV.SLCN.HHN. ML:1.3 0.0000916 1.58 AML other m 2021-01-20T02:58:24.10
IV.MGR.HHE. ML:1.2 0.000049500000000000004 0.54 AML other m 2021-01-20T02:58:26.46
IV.SIRI.HHE. ML:1.2 0.0000359 0.42 AML other m 2021-01-20T02:58:28.47
IV.SIRI.HHN. ML:1.3 0.00004295 0.8 AML other m 2021-01-20T02:58:30.16
IV.SIRI.HNE. ML:1.1 0.00002952793 0.28 AML other m 2021-01-20T02:58:28.27
IV.SIRI.HNN. ML:1.3 0.00003821106000000001 0.2192 AML other m 2021-01-20T02:58:28.12
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