Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 28-02-2020 and time 04:21:55 (Italy) in region 4 km NE Marradi (FI)

A magnitude ML 1.5 earthquake occured in region: 4 km NE Marradi (FI), on

  • 28-02-2020 03:21:55 (UTC)
  • 28-02-2020 04:21:55 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1080, 11.6430 at 8 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
Marradi FI 4 3139 3139
Palazzuolo sul Senio FI 8 1154 4293
Tredozio FC 9 1212 5505
Casola Valsenio RA 13 2617 8122
Modigliana FC 13 4560 12682
Portico e San Benedetto FC 14 756 13438
Castel del Rio BO 16 1246 14684
Brisighella RA 16 7639 22323
Rocca San Casciano FC 17 1910 24233
Premilcuore FC 18 799 25032
Fontanelice BO 18 1943 26975
Borgo Tossignano BO 19 3288 30263
Dovadola FC 20 1653 31916
Riolo Terme RA 20 5720 37636

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Faenza (58541 inhabitants)
28 Km S of Imola (69797 inhabitants)
34 Km W of Forlì (117913 inhabitants)
48 Km W of Cesena (96758 inhabitants)
49 Km NE of Firenze (382808 inhabitants)
49 Km SE of Bologna (386663 inhabitants)
50 Km NE of Prato (191150 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
61 Km E of Pistoia (90315 inhabitants)
74 Km N of Arezzo (99543 inhabitants)
74 Km W of Rimini (147750 inhabitants)
81 Km S of Ferrara (133155 inhabitants)
83 Km SE of Modena (184973 inhabitants)
91 Km N of Siena (53903 inhabitants)
96 Km E of Lucca (89046 inhabitants)
96 Km SE of Carpi (70699 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 1.5 2020-02-28
03:21:55		 44.108 11.6433 8 2020-07-18
21:08:25		 Bollettino Sismico Italiano INGV 77190211
Reviewed
Rev100 		ML 1.6 2020-02-28
03:21:55		 44.1153 11.6468 10 2020-02-28
03:25:37		 Sala Sismica INGV-Roma 76881621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-02-28 03:21:55 ± 0.07
Latitude 44.1080 ± 0.0036
Longitude 11.6433 ± 0.0050
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 77190211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 430
Semi-minor axis of confidence ellipse (meter) 10
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 125
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
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) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.05486
Epicentral distance of station farthest from the epicenter (degree) 0.37772
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 77190211
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-03-11 11:48:37

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 76881621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-02-28 03:25:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FNVD.HHZ. 2020-02-28T03:22:10.11 0.3 undecidable manual S 279 41.9247 50 -0.03 71
IV.BRSN.HNE. 2020-02-28T03:22:09.87 0.3 undecidable manual S 60 39.8268 50 0.29 68
IV.ASQU.HHZ. 2020-02-28T03:22:08.33 0.1 undecidable manual S 161 36.4413 50 -0.34 90
IV.RUFI.EHZ. 2020-02-28T03:22:07.49 0.3 undecidable manual S 200 31.8459 104 0.31 68
IV.IMOL.HNZ. 2020-02-28T03:22:06.65 0.3 undecidable manual S 16 28.9488 105 0.41 67
IV.RINC.HHZ. 2020-02-28T03:22:05.25 0.1 undecidable manual S 187 24.753 108 0.42 90
IV.SFI.EHZ. 2020-02-28T03:22:05.88 0.1 undecidable manual S 144 27.75 106 0.04 97
IV.FAEN.HNZ. 2020-02-28T03:22:05.62 0.3 undecidable manual S 43 27.3504 106 -0.09 72
IV.SEI.HHZ. 2020-02-28T03:22:04.29 0.1 undecidable manual S 255 23.4543 109 -0.11 96
IV.FNVD.HHZ. 2020-02-28T03:22:04.25 0.3 undecidable manual P 279 41.9247 50 0.17 69
IV.BRSN.HNE. 2020-02-28T03:22:04.61 0.3 undecidable manual P 60 39.8268 50 0.85 56
IV.RONT.HHZ. 2020-02-28T03:22:04.30 0.1 undecidable manual S 233 21.0678 111 0.69 83
IV.FAEN.HNZ. 2020-02-28T03:22:02.06 0.3 undecidable manual P 43 27.3504 106 0.54 65
IV.RUFI.EHZ. 2020-02-28T03:22:02.06 0.3 positive manual P 200 31.8459 104 -0.31 68
IV.VISG.HHZ. 2020-02-28T03:22:02.67 0.1 undecidable manual S 298 18.87 113 -0.25 94
IV.ASQU.HHZ. 2020-02-28T03:22:02.73 0.1 positive manual P 161 36.4413 50 -0.5 87
IV.SFI.EHZ. 2020-02-28T03:22:01.30 0.1 positive manual P 144 27.75 106 -0.3 92
IV.IMOL.HNZ. 2020-02-28T03:22:01.79 0.3 positive manual P 16 28.9488 105 -0.04 73
IV.BRIS.HHZ. 2020-02-28T03:22:01.97 0.1 undecidable manual S 37 16.2726 116 -0.11 98
IV.RONT.HHZ. 2020-02-28T03:22:00.45 0.1 positive manual P 233 21.0678 111 0.14 96
IV.SEI.HHZ. 2020-02-28T03:22:00.56 0.1 positive manual P 255 23.4543 109 -0.21 95
IV.RINC.HHZ. 2020-02-28T03:22:00.98 0.1 positive manual P 187 24.753 108 -0.03 98
IV.VISG.HHZ. 2020-02-28T03:21:59.62 0.1 positive manual P 298 18.87 113 -0.29 94
IV.LMD.HHZ. 2020-02-28T03:21:59.22 0.1 undecidable manual S 124 6.0939 143 -0.08 100
IV.BRIS.HHZ. 2020-02-28T03:21:59.20 0.1 positive manual P 37 16.2726 116 -0.23 95
IV.LMD.HHZ. 2020-02-28T03:21:57.67 0.1 positive manual P 124 6.0939 143 -0.15 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:2.0 0.00104266245 0.3008 AML other m 2020-02-28T03:22:02.99
IV.BRIS.HHE. ML:1.8 0.0005701654499999999 0.4 AML other m 2020-02-28T03:22:02.39
IV.VISG.HHE. ML:1.3 0.000154386 0.3216 AML other m 2020-02-28T03:22:02.88
IV.VISG.HHN. ML:1.5 0.00025033335 0.0992 AML other m 2020-02-28T03:22:03.21
IV.RONT.HHE. ML:1.6 0.00030792925 0.5392 AML other m 2020-02-28T03:22:04.65
IV.RONT.HHN. ML:1.7 0.00035969085 0.1184 AML other m 2020-02-28T03:22:04.80
IV.SEI.HHE. ML:1.8 0.000436632 0.56 AML other m 2020-02-28T03:22:04.00
IV.SEI.HHN. ML:1.9 0.0005304765500000001 0.3008 AML other m 2020-02-28T03:22:04.94
IV.RINC.HHE. ML:1.2 0.000103716965 0.2 AML other m 2020-02-28T03:22:06.12
IV.SFI.EHE. ML:1.2 0.000088512135 0.8592 AML other m 2020-02-28T03:22:05.95
IV.SFI.HNE. ML:1.4 0.00012059735000000001 0.9504 AML other m 2020-02-28T03:22:06.07
IV.SFI.EHN. ML:1.3 0.000102401905 0.2 AML other m 2020-02-28T03:22:06.02
IV.ASQU.HHN. ML:1.2 0.000054286365 0.24 AML other m 2020-02-28T03:22:09.20
IV.ASQU.HHE. ML:1.4 0.00008804252000000002 0.24 AML other m 2020-02-28T03:22:08.61
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