Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 20-01-2021 and time 06:20:21 (Italy) in region 4 km E Castel San Lorenzo (SA)

A magnitude ML 1.4 earthquake occured in region: 4 km E Castel San Lorenzo (SA), on

  • 20-01-2021 05:20:21 (UTC)
  • 20-01-2021 06:20:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 40.4120, 15.2700 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
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
Sant'Angelo a Fasanella SA 8 635 16067
Monteforte Cilento SA 8 564 16631
Sacco SA 9 492 17123
Castelcivita SA 10 1739 18862
Corleto Monforte SA 10 592 19454
Laurino SA 10 1548 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
Petina SA 16 1159 38932
Capaccio Paestum SA 16 22810 61742
Perito SA 16 931 62673
Postiglione SA 17 2151 64824
San Rufo SA 17 1754 66578
Sicignano degli Alburni SA 17 3519 70097
Altavilla Silentina SA 17 7051 77148
Moio della Civitella SA 19 1827 78975
Cannalonga SA 19 1063 80038
San Pietro al Tanagro SA 19 1695 81733
Prignano Cilento SA 19 1018 82751
Salento SA 19 1977 84728
Sant'Arsenio SA 20 2815 87543

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)
57 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 Benevento (60091 inhabitants)
90 Km SE of Portici (55274 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 1.4 2021-01-20
05:20:21		 40.4122 15.2698 15 2021-07-12
16:54:56		 Bollettino Sismico Italiano INGV 86697521
Reviewed
Rev100 		ML 1.4 2021-01-20
05:20:21		 40.4143 15.2632 16 2021-01-20
05:34:37		 Sala Sismica INGV-Roma 86391081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-20 05:20:21 ± 0.18
Latitude 40.4122 ± 0.0081
Longitude 15.2698 ± 0.0130
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 86697521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 950
Semi-minor axis of confidence ellipse (meter) 761
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 52
Circular confidence region, given by single value of horizontal uncertainty (meter) 950.0
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 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.08184
Epicentral distance of station farthest from the epicenter (degree) 0.37861
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 86391081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-20 05:34:37

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 86697521
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-29 21:32:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MCRV.HHN. 2021-01-20T05:20:35.24 0.6 undecidable manual S 348 42.0246 98 -0.25 47
IT.SLC1.HGE. 2021-01-20T05:20:32.20 0.6 undecidable manual S 94 27.6501 105 0.46 46
IV.SLCN.HHZ. 2021-01-20T05:20:32.80 0.3 undecidable manual S 94 30.747 103 0.25 71
IV.MCRV.HHN. 2021-01-20T05:20:30.36 0.3 undecidable manual P 348 42.0246 98 0.68 62
IV.BULG.HHZ. 2021-01-20T05:20:29.08 0.3 undecidable manual P 166 38.1285 100 -0.02 74
IV.SGO.HHZ. 2021-01-20T05:20:28.80 0.3 undecidable manual S 11 16.7721 121 -0.26 73
IV.MGR.HHZ. 2021-01-20T05:20:28.61 0.3 undecidable manual P 142 38.7279 99 -0.59 64
IX.STN3.HHE.02 2021-01-20T05:20:28.33 0.3 undecidable manual P 68 34.743 101 -0.26 71
IV.SLCN.HHZ. 2021-01-20T05:20:28.16 0.3 undecidable manual P 94 30.747 103 0.18 72
IV.CDRU.HHZ. 2021-01-20T05:20:27.20 0.3 undecidable manual S 19 9.0798 143 -0.32 73
IT.SLC1.HGE. 2021-01-20T05:20:27.50 0.3 undecidable manual P 94 27.6501 105 -0.01 75
IV.CMPR.HHZ. 2021-01-20T05:20:27.80 0.3 undecidable manual S 165 10.7781 137 -0.02 77
IV.SGO.HHZ. 2021-01-20T05:20:26.06 0.3 undecidable manual P 11 16.7721 121 0.09 75
IX.TEGI.HNZ.01 2021-01-20T05:20:26.40 0.6 undecidable manual P 99 22.755 111 -0.41 47
IV.CDRU.HHZ. 2021-01-20T05:20:25.25 0.1 undecidable manual P 19 9.0798 143 0.17 100
IV.CMPR.HHZ. 2021-01-20T05:20:25.46 0.3 undecidable manual P 165 10.7781 137 0.21 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CDRU.HHN. ML:1.5 0.00033183885 0.1184 AML other m 2021-01-20T05:20:27.58
IV.CMPR.HHN. ML:1.7 0.00043338069999999994 1.8592 AML other m 2021-01-20T05:20:27.96
IV.CMPR.HHE. ML:1.7 0.000484 0.16 AML other m 2021-01-20T05:20:28.04
IV.CDRU.HHE. ML:1.5 0.00029941425 0.1184 AML other m 2021-01-20T05:20:28.29
IV.BULG.HHN. ML:1.3 0.000067428735 0.3008 AML other m 2021-01-20T05:20:28.42
IV.SGO.HNE. ML:1.3 0.000135345295 1.7984 AML other m 2021-01-20T05:20:28.01
IV.SGO.HHN. ML:1.6 0.0003275 1.84 AML other m 2021-01-20T05:20:29.93
IV.SGO.HNN. ML:1.6 0.00030536235 1.8304 AML other m 2021-01-20T05:20:29.93
IV.SGO.HHE. ML:1.3 0.00014855764999999999 0.2624 AML other m 2021-01-20T05:20:29.69
IV.MGR.HHE. ML:0.9 0.000026820465000000003 0.24 AML other m 2021-01-20T05:20:35.13
IV.MGR.HHN. ML:1.2 0.00004867386999999999 1.6992 AML other m 2021-01-20T05:20:35.98
IV.BULG.HNE. ML:0.9 0.000030370395000000003 0.2016 AML other m 2021-01-20T05:20:37.58
IV.BULG.HHE. ML:0.9 0.00003205316 0.2016 AML other m 2021-01-20T05:20:37.48
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