Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 20-08-2021 and time 21:47:30 (UTC) in region Costa Cilentana (Salerno)

A magnitude ML 1.3 earthquake occured in region: Costa Cilentana (Salerno), on

  • 20-08-2021 21:47:30 (UTC)
  • 20-08-2021 23:47:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.9720, 15.0780 at 10 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
71 Km S of Battipaglia (50786 inhabitants)
83 Km SE of Salerno (135261 inhabitants)
87 Km SE of Cava de' Tirreni (53659 inhabitants)
95 Km SE of Castellammare di Stabia (66466 inhabitants)
97 Km SW of Potenza (67122 inhabitants)
98 Km SE of Scafati (50787 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 1.3 2021-08-20
21:47:30		 39.9718 15.0785 10 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 98138861
Reviewed
Rev100 		ML 1.3 2021-08-20
21:47:30		 39.9678 15.0498 10 2021-08-20
21:55:58		 Sala Sismica INGV-Roma 94442391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-20 21:47:30 ± 0.39
Latitude 39.9718 ± 0.0135
Longitude 15.0785 ± 0.0282
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98138861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2550
Semi-minor axis of confidence ellipse (meter) 1250
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 250
Circular confidence region, given by single value of horizontal uncertainty (meter) 2550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 255
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) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.38581
Epicentral distance of station farthest from the epicenter (degree) 0.80579
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 98138861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-04 17:54:52

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 94442391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-20 21:55:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CDRU.HHZ. 2021-08-20T21:47:50.30 0.6 undecidable manual S 18 60.495 50 0.45 53
MN.CUC.HNZ. 2021-08-20T21:47:50.96 0.6 undecidable manual S 88 62.6928 50 0.54 51
IV.CET2.HHE. 2021-08-20T21:47:46.57 0.3 undecidable manual P 123 89.4438 50 0.29 78
IV.MMN.HHZ. 2021-08-20T21:47:45.42 0.6 undecidable manual P 96 78.0663 50 0.89 43
IV.MGR.HHZ. 2021-08-20T21:47:45.04 0.6 undecidable manual S 65 44.3223 50 -0.48 54
IV.CMPR.HHZ. 2021-08-20T21:47:45.32 0.6 undecidable manual S 26 42.8238 50 0.19 58
IV.GRIS.EHZ. 2021-08-20T21:47:43.13 0.6 undecidable manual P 111 70.7736 50 -0.28 54
IV.SLCN.HNZ. 2021-08-20T21:47:43.69 0.6 undecidable manual P 45 65.9895 50 1.02 42
IV.SIRI.HHZ. 2021-08-20T21:47:43.53 0.6 undecidable manual P 71 70.8735 50 0.1 56
IV.MTSN.HNZ. 2021-08-20T21:47:42.56 0.3 undecidable manual P 60 65.7897 50 -0.07 85
IX.SRN3.HNE.02 2021-08-20T21:47:42.48 0.3 undecidable manual P 29 65.49 50 -0.11 85
MN.CUC.HNZ. 2021-08-20T21:47:41.88 0.3 undecidable manual P 88 62.6928 50 -0.28 82
IX.TEGI.HNZ.01 2021-08-20T21:47:41.55 0.6 undecidable manual P 40 59.5959 50 -0.14 57
IV.CDRU.HHZ. 2021-08-20T21:47:41.74 0.3 undecidable manual P 18 60.495 50 -0.09 86
IV.CMPR.HHZ. 2021-08-20T21:47:39.04 0.3 undecidable manual P 26 42.8238 50 -0.06 89
IV.MGR.HHZ. 2021-08-20T21:47:38.63 0.1 positive manual P 65 44.3223 50 -0.7 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MGR.HHN. ML:1.3 0.00005574999999999999 1.16 AML other m 2021-08-20T21:47:47.08
IV.CMPR.HHE. ML:1.0 0.00003365 0.58 AML other m 2021-08-20T21:47:48.29
IV.CMPR.HHN. ML:1.0 0.0000366 0.6 AML other m 2021-08-20T21:47:49.04
IV.MGR.HHE. ML:1.2 0.000046949999999999996 0.2 AML other m 2021-08-20T21:47:51.39
IX.NSC3.EHE.02 ML:1.5 0.00002765 0.06 AML other m 2021-08-20T21:47:55.35
IX.NSC3.EHN.02 ML:1.5 0.0000369 0.04 AML other m 2021-08-20T21:47:55.35
IV.GRIS.EHE. ML:1.5 0.000056500000000000005 0.7 AML other m 2021-08-20T21:47:55.86
IV.GRIS.EHN. ML:1.5 0.0000483 0.78 AML other m 2021-08-20T21:47:55.68
IV.SIRI.HHN. ML:1.4 0.00003825 0.42 AML other m 2021-08-20T21:47:59.44
IV.SIRI.HHE. ML:1.0 0.00001695 0.9 AML other m 2021-08-20T21:47:59.30
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