Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 28-02-2020 and time 01:55:12 (Italy) in region 5 km NE Marradi (FI)

A magnitude ML 0.7 earthquake occured in region: 5 km NE Marradi (FI), on

  • 28-02-2020 00:55:12 (UTC)
  • 28-02-2020 01:55:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1150, 11.6490 at 10 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
Marradi FI 5 3139 3139
Palazzuolo sul Senio FI 8 1154 4293
Tredozio FC 9 1212 5505
Casola Valsenio RA 12 2617 8122
Modigliana FC 13 4560 12682
Portico e San Benedetto FC 14 756 13438
Brisighella RA 15 7639 21077
Castel del Rio BO 16 1246 22323
Rocca San Casciano FC 17 1910 24233
Fontanelice BO 18 1943 26176
Premilcuore FC 18 799 26975
Borgo Tossignano BO 19 3288 30263
Dovadola FC 19 1653 31916
Riolo Terme RA 19 5720 37636

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SW of Faenza (58541 inhabitants)
27 Km S of Imola (69797 inhabitants)
34 Km W of Forlì (117913 inhabitants)
48 Km W of Cesena (96758 inhabitants)
49 Km SE of Bologna (386663 inhabitants)
50 Km NE of Firenze (382808 inhabitants)
51 Km NE of Prato (191150 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
55 Km SW of Ravenna (159116 inhabitants)
62 Km E of Pistoia (90315 inhabitants)
74 Km W of Rimini (147750 inhabitants)
74 Km N of Arezzo (99543 inhabitants)
80 Km S of Ferrara (133155 inhabitants)
82 Km SE of Modena (184973 inhabitants)
92 Km N of Siena (53903 inhabitants)
96 Km SE of Carpi (70699 inhabitants)
97 Km E of Lucca (89046 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 0.7 2020-02-28
00:55:12		 44.1148 11.6488 10 2020-02-28
01:02:00		 Sala Sismica INGV-Roma 76880321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-02-28 00:55:12 ± 0.09
Latitude 44.1148 ± 0.0054
Longitude 11.6488 ± 0.0050
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 76880321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 559
Semi-minor axis of confidence ellipse (meter) 427
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 345
Circular confidence region, given by single value of horizontal uncertainty (meter) 560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.05576
Epicentral distance of station farthest from the epicenter (degree) 0.33365
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 76880321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-02-28 01:02:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RINC.HHN. 2020-02-28T00:55:22.11 0.1 undecidable manual S 188 25.5522 111 0.16 96
IV.SEI.HHZ. 2020-02-28T00:55:21.51 0.3 undecidable manual S 254 24.0537 112 0.03 75
IV.RONT.HHZ. 2020-02-28T00:55:21.24 0.3 undecidable manual S 232 21.867 114 0.48 69
IV.ASQU.HHZ. 2020-02-28T00:55:19.66 0.3 undecidable manual P 162 37.0296 50 -0.07 73
IV.VISG.HHZ. 2020-02-28T00:55:19.64 0.3 undecidable manual S 296 18.9699 117 -0.22 73
IV.BRIS.HHZ. 2020-02-28T00:55:19.23 0.3 undecidable manual S 38 15.3735 123 0.46 69
IV.SFI.EHE. 2020-02-28T00:55:18.23 0.1 undecidable manual P 146 28.1496 50 -0.14 98
IV.SEI.HHZ. 2020-02-28T00:55:17.52 0.1 undecidable manual P 254 24.0537 112 -0.14 97
IV.RONT.HHZ. 2020-02-28T00:55:17.37 0.1 undecidable manual P 232 21.867 114 0.12 98
IV.RINC.HHN. 2020-02-28T00:55:17.99 0.3 undecidable manual P 188 25.5522 111 0.06 74
IV.BRIS.HHZ. 2020-02-28T00:55:16.16 0.1 undecidable manual P 38 15.3735 123 0.06 100
IV.VISG.HHZ. 2020-02-28T00:55:16.54 0.1 undecidable manual P 296 18.9699 117 -0.18 98
IV.LMD.HHZ. 2020-02-28T00:55:16.26 0.3 undecidable manual S 132 6.1938 148 -0.23 73
IV.LMD.HHZ. 2020-02-28T00:55:14.62 0.1 undecidable manual P 132 6.1938 148 -0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:0.8 0.00010111589 2.56 AML other m 2020-02-28T00:55:16.46
IV.LMD.HHN. ML:0.8 0.00009833690000000001 0.26 AML other m 2020-02-28T00:55:16.28
IV.VISG.HHE. ML:0.5 0.000022743325 1.14 AML other m 2020-02-28T00:55:20.66
IV.VISG.HHN. ML:0.8 0.00004293289 2.34 AML other m 2020-02-28T00:55:20.15
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