Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 04-02-2021 and time 04:19:38 (Italy) in region Tirreno Meridionale (MARE)

A magnitude ML 1.8 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 04-02-2021 03:19:38 (UTC)
  • 04-02-2021 04:19:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 38.4600, 15.4970 at 131 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
30 Km N of Messina (238439 inhabitants)
41 Km NW of Reggio di Calabria (183035 inhabitants)
92 Km SW of Lamezia Terme (70714 inhabitants)
99 Km N of Acireale (52622 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 1.8 2021-02-04
03:19:38		 38.4598 15.4973 131 2021-07-12
16:55:00		 Bollettino Sismico Italiano INGV 87708571
Reviewed
Rev100 		ML 1.9 2021-02-04
03:19:37		 38.4735 15.5193 132 2021-02-04
03:34:13		 Sala Sismica INGV-Roma 86822251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-04 03:19:38 ± 0.19
Latitude 38.4598 ± 0.0108
Longitude 15.4973 ± 0.0149
Depth (km) 131 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87708571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1266
Semi-minor axis of confidence ellipse (meter) 799
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 131
Circular confidence region, given by single value of horizontal uncertainty (meter) 1270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 50
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.19605
Epicentral distance of station farthest from the epicenter (degree) 1.44881
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.1
Num. used stations 9
Type of magnitude ML
Reference to an origin 87708571
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-22 11:37:12

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 86822251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-04 03:34:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GRIS.HNE. 2021-02-04T03:20:23.43 0.6 undecidable manual S 12 145.3434 128 -0.4 38
IV.CELI.HHE. 2021-02-04T03:20:23.01 0.6 undecidable manual S 40 136.2636 130 0.7 35
MN.TIP.HHZ. 2021-02-04T03:20:22.39 0.6 undecidable manual S 53 135.0648 130 0.26 40
IV.SERS.HNN. 2021-02-04T03:20:20.53 0.6 undecidable manual S 58 121.2897 134 0.61 38
IV.SELL.HHZ. 2021-02-04T03:20:20.00 0.6 undecidable manual S 59 113.7972 136 1.23 29
IV.CET2.HHZ. 2021-02-04T03:20:19.88 0.6 undecidable manual S 18 124.986 133 -0.62 37
IV.SPS2.HHE. 2021-02-04T03:20:18.95 0.6 undecidable manual S 38 117.3936 135 -0.37 41
IV.PLAC.HHE. 2021-02-04T03:20:14.40 0.6 undecidable manual S 91 81.7515 145 0.03 47
IV.SOI.EHE. 2021-02-04T03:20:12.38 0.6 undecidable manual S 131 64.7907 152 -0.08 48
IV.FERC.HNN. 2021-02-04T03:20:11.58 0.6 undecidable manual S 91 54.8007 155 0.08 49
MN.CEL.HHZ. 2021-02-04T03:20:10.55 0.3 undecidable manual S 123 41.0256 161 0.15 74
IV.JOPP.HHZ. 2021-02-04T03:20:10.13 0.3 undecidable manual S 64 37.4292 163 -0.03 76
IV.SICLA.EHZ. 2021-02-04T03:20:09.51 0.3 undecidable manual S 140 29.4483 166 -0.19 75
IV.MSRU.HHZ. 2021-02-04T03:20:09.38 0.3 undecidable manual S 177 21.7671 170 0.03 78
IV.PIPA.HHZ. 2021-02-04T03:20:05.84 0.3 undecidable manual P 45 160.8168 125 -0.17 56
IV.GRIS.HNE. 2021-02-04T03:20:04.83 0.6 undecidable manual P 12 145.3434 128 0.37 38
IV.CELI.HHE. 2021-02-04T03:20:03.76 0.3 undecidable manual P 40 136.2636 130 0.17 61
MN.TIP.HHZ. 2021-02-04T03:20:03.26 0.3 undecidable manual P 53 135.0648 130 -0.22 60
IV.SERS.HNN. 2021-02-04T03:20:02.24 0.1 undecidable manual P 58 121.2897 134 0.04 87
IV.CET2.HHZ. 2021-02-04T03:20:02.65 0.3 undecidable manual P 18 124.986 133 0.11 63
IV.SPS2.HHE. 2021-02-04T03:20:01.65 0.6 undecidable manual P 38 117.3936 135 -0.21 42
IV.SELL.HHZ. 2021-02-04T03:20:01.71 0.3 undecidable manual P 59 113.7972 136 0.17 64
IV.MSFR.HHE. 2021-02-04T03:19:59.96 0.3 undecidable manual P 239 91.9413 142 0.2 66
IV.IFIL.HHE. 2021-02-04T03:19:59.12 0.1 positive manual P 279 80.8635 146 0.18 91
IV.AIO.HHE. 2021-02-04T03:19:58.05 0.3 undecidable manual P 203 58.8966 154 0.49 67
IV.PLAC.HHE. 2021-02-04T03:19:58.90 0.1 positive manual P 91 81.7515 145 -0.1 92
IV.MUCR.HHE. 2021-02-04T03:19:58.39 0.3 undecidable manual P 230 71.373 149 0.09 71
IV.NOV.HHE. 2021-02-04T03:19:58.16 0.3 undecidable manual P 213 57.2982 154 0.69 62
IV.FERC.HNN. 2021-02-04T03:19:57.32 0.3 undecidable manual P 91 54.8007 155 -0.02 74
IV.SOI.EHE. 2021-02-04T03:19:57.72 0.1 positive manual P 131 64.7907 152 -0.17 93
IV.IVUG.HHE. 2021-02-04T03:19:56.96 0.1 negative manual P 261 45.0216 159 0.09 99
IV.MILZ.HHZ. 2021-02-04T03:19:56.04 0.3 undecidable manual P 228 31.1466 165 -0.32 73
IV.IVPL.HHZ. 2021-02-04T03:19:56.94 0.1 positive manual P 259 45.9207 159 0.03 100
MN.CEL.HHZ. 2021-02-04T03:19:56.47 0.1 positive manual P 123 41.0256 161 -0.24 97
IV.IST3.HHE. 2021-02-04T03:19:56.92 0.3 undecidable manual P 329 44.2224 160 0.08 74
IV.JOPP.HHZ. 2021-02-04T03:19:56.26 0.1 undecidable manual P 64 37.4292 163 -0.31 96
IV.SICLA.EHZ. 2021-02-04T03:19:55.85 0.3 undecidable manual P 140 29.4483 166 -0.45 71
IV.MSRU.HHZ. 2021-02-04T03:19:55.63 0.1 positive manual P 177 21.7671 170 -0.47 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MSRU.HHN. ML:1.7 0.000035513245 0.16 AML other m 2021-02-04T03:20:10.04
IV.MSRU.HHE. ML:1.9 0.000047859935 0.3008 AML other m 2021-02-04T03:20:10.44
MN.CEL.HHN. ML:1.8 0.00003571147 1.7408 AML other m 2021-02-04T03:20:10.01
MN.CEL.HNN. ML:1.9 0.000043450024999999994 0.2416 AML other m 2021-02-04T03:20:10.77
IV.JOPP.HHE. ML:1.8 0.00003443614 0.0992 AML other m 2021-02-04T03:20:10.95
IV.JOPP.HHN. ML:1.8 0.000039022945000000005 0.12 AML other m 2021-02-04T03:20:11.10
IV.MILZ.HHN. ML:1.9 0.000044153865 0.28 AML other m 2021-02-04T03:20:11.04
IV.MILZ.HHE. ML:2.0 0.000060279885 0.2992 AML other m 2021-02-04T03:20:11.43
MN.CEL.HHE. ML:1.5 0.00001954244 0.2 AML other m 2021-02-04T03:20:12.18
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