Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-02-2021 and time 20:53:47 (Italy) in region 12 km W Cervia (RA)

A magnitude ML 1.4 earthquake occured in region: 12 km W Cervia (RA), on

  • 04-02-2021 19:53:47 (UTC)
  • 04-02-2021 20:53:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2980, 12.2120 at 27 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Cervia RA 12 28940 28940
Ravenna RA 13 159116 188056
Forlimpopoli FC 14 13290 201346
Forlì FC 16 117913 319259
Russi RA 17 12247 331506
Bertinoro FC 18 11059 342565
Cesena FC 18 96758 439323
Cesenatico FC 18 25796 465119

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km S of Ravenna (159116 inhabitants)
16 Km NE of Forlì (117913 inhabitants)
18 Km N of Cesena (96758 inhabitants)
26 Km E of Faenza (58541 inhabitants)
39 Km NW of Rimini (147750 inhabitants)
40 Km E of Imola (69797 inhabitants)
71 Km NW of Pesaro (94582 inhabitants)
73 Km E of Bologna (386663 inhabitants)
76 Km SE of Ferrara (133155 inhabitants)
82 Km NW of Fano (60888 inhabitants)
92 Km SE of Rovigo (51867 inhabitants)
96 Km N of Arezzo (99543 inhabitants)
96 Km NE of Firenze (382808 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
Reviewed
Rev100 		ML 1.4 2021-02-04
19:53:47		 44.2975 12.2118 27 2021-02-04
20:13:27		 Sala Sismica INGV-Roma 86836141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-04 19:53:47 ± 0.35
Latitude 44.2975 ± 0.0171
Longitude 12.2118 ± 0.0188
Depth (km) 27 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86836141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1775
Semi-minor axis of confidence ellipse (meter) 1243
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 333
Circular confidence region, given by single value of horizontal uncertainty (meter) 1770.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 309
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 12
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.68169
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 86836141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-04 20:13:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CR.ZAG.BHZ. 2021-02-04T19:55:16.88 3.0 undecidable manual Sn -2.35 0
IV.MILN.HNZ. 2021-02-04T19:55:12.58 3.0 undecidable manual Sg 8.48 0
ST.CARE.EHZ. 2021-02-04T19:55:04.43 3.0 undecidable manual Sg 0.38 0
IV.RUFI.EHZ. 2021-02-04T19:54:11.30 1.0 undecidable manual S 228 75.6687 104 0.15 30
IV.ASQU.HHZ. 2021-02-04T19:54:08.58 0.3 undecidable manual S 211 64.9905 106 0.2 91
IV.SFI.EHZ. 2021-02-04T19:54:05.47 0.3 undecidable manual S 214 52.4031 111 0.28 91
IV.LMD.HHZ. 2021-02-04T19:54:03.20 0.6 undecidable manual S 239 47.0196 113 -0.65 53
IV.RUFI.EHZ. 2021-02-04T19:54:01.52 0.6 undecidable manual P 228 75.6687 104 0.16 59
IV.BRIS.HHZ. 2021-02-04T19:54:01.50 0.3 undecidable manual S 257 36.3414 120 0.2 95
IV.ASQU.HHZ. 2021-02-04T19:54:00.03 0.3 undecidable manual P 211 64.9905 106 0.27 89
IV.SFI.EHZ. 2021-02-04T19:53:57.56 0.3 undecidable manual P 214 52.4031 111 -0.35 88
IV.LMD.HHZ. 2021-02-04T19:53:56.78 0.3 undecidable manual P 239 47.0196 113 -0.37 89
IV.BRSN.EHZ. 2021-02-04T19:53:56.40 0.3 undecidable manual S 262 10.5783 156 -0.15 100
IV.BRIS.HHZ. 2021-02-04T19:53:55.89 0.3 undecidable manual P 257 36.3414 120 0.22 94
IV.BRSN.EHZ. 2021-02-04T19:53:52.79 0.3 undecidable manual P 262 10.5783 156 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:1.5 0.00010085 0.6 AML other m 2021-02-04T19:54:01.68
IV.BRIS.HHN. ML:1.5 0.00010225 0.3 AML other m 2021-02-04T19:54:01.80
IV.LMD.HHN. ML:1.4 0.000052584079999999995 0.7552 AML other m 2021-02-04T19:54:03.53
IV.LMD.HHE. ML:1.2 0.000042382895000000003 0.384 AML other m 2021-02-04T19:54:03.39
IV.SFI.EHN. ML:1.5 0.0000739 0.16 AML other m 2021-02-04T19:54:06.08
IV.SFI.EHE. ML:1.4 0.000050176415000000004 0.1792 AML other m 2021-02-04T19:54:06.73
IV.ASQU.HHE. ML:1.5 0.0000526 0.2 AML other m 2021-02-04T19:54:09.30
IV.ASQU.HHN. ML:1.5 0.000057400000000000006 1.02 AML other m 2021-02-04T19:54:09.37
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