Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 15-02-2021 and time 19:38:29 (Italy) in region 3 km SW Santa Sofia (FC)

A magnitude ML 1.0 earthquake occured in region: 3 km SW Santa Sofia (FC), on

  • 15-02-2021 18:38:29 (UTC)
  • 15-02-2021 19:38:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9250, 11.8860 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
Santa Sofia FC 3 4136 4136
Galeata FC 8 2516 6652
Civitella di Romagna FC 10 3786 10438
Bagno di Romagna FC 10 6026 16464
Premilcuore FC 11 799 17263
Portico e San Benedetto FC 14 756 18019
Rocca San Casciano FC 16 1910 19929
Verghereto FC 17 1907 21836
Pratovecchio Stia AR 20 5845 27681

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SW of Forlì (117913 inhabitants)
37 Km SW of Cesena (96758 inhabitants)
40 Km S of Faenza (58541 inhabitants)
50 Km S of Imola (69797 inhabitants)
51 Km N of Arezzo (99543 inhabitants)
53 Km E of Firenze (382808 inhabitants)
57 Km W of Rimini (147750 inhabitants)
59 Km E of Scandicci (50609 inhabitants)
60 Km SW of Ravenna (159116 inhabitants)
63 Km E of Prato (191150 inhabitants)
77 Km SE of Bologna (386663 inhabitants)
78 Km E of Pistoia (90315 inhabitants)
81 Km NE of Siena (53903 inhabitants)
82 Km W of Pesaro (94582 inhabitants)
91 Km W of Fano (60888 inhabitants)
100 Km NW of Perugia (166134 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 1.0 2021-02-15
18:38:29		 43.9252 11.8858 10 2021-02-15
18:44:34		 Sala Sismica INGV-Roma 87184891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-15 18:38:29 ± 0.09
Latitude 43.9252 ± 0.0018
Longitude 11.8858 ± 0.0075
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87184891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 566
Semi-minor axis of confidence ellipse (meter) 71
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 248
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.06
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.28509
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 87184891
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-15 18:44:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFE.HHZ. 2021-02-15T18:39:07.27 3.0 undecidable manual Pn -4.09 0
IV.MILN.HNZ. 2021-02-15T18:39:06.02 3.0 negative manual Pn 5.2 0
IV.IOCA.HHZ. 2021-02-15T18:39:01.97 3.0 negative manual Pn -3.09 0
IV.MMO1.EHZ. 2021-02-15T18:38:38.62 3.0 negative manual P -2.53 0
IV.LMD.HHZ. 2021-02-15T18:38:38.18 0.3 undecidable manual S 320 22.0668 115 0.06 72
IV.PIEI.HHZ. 2021-02-15T18:38:38.58 3.0 undecidable manual S -5.08 0
IV.CRTC.HHZ. 2021-02-15T18:38:38.85 3.0 undecidable manual P 1.51 0
IV.RUFI.EHZ. 2021-02-15T18:38:36.14 0.3 undecidable manual P 252 31.6461 50 0.04 71
IV.ASQU.HHZ. 2021-02-15T18:38:36.30 0.3 undecidable manual S 208 16.1727 122 -0.01 73
IV.RINC.HHE. 2021-02-15T18:38:34.59 0.3 undecidable manual P 259 22.6551 114 -0.07 72
IV.LMD.HHZ. 2021-02-15T18:38:34.47 0.3 undecidable manual P 320 22.0668 115 -0.09 71
IV.ASQU.HHZ. 2021-02-15T18:38:33.54 0.1 undecidable manual P 208 16.1727 122 0.03 97
IV.SFI.EHZ. 2021-02-15T18:38:33.44 0.1 undecidable manual S 234 3.8961 159 0.01 100
IV.SFI.EHZ. 2021-02-15T18:38:31.85 0.1 undecidable manual P 234 3.8961 159 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.EHE. ML:0.8 0.00010440892999999999 0.0896 AML other m 2021-02-15T18:38:33.72
IV.SFI.EHN. ML:1.0 0.000193 0.1 AML other m 2021-02-15T18:38:33.66
IV.ASQU.HHN. ML:0.9 0.00006745 0.32 AML other m 2021-02-15T18:38:36.78
IV.ASQU.HHE. ML:1.0 0.00008525 0.36 AML other m 2021-02-15T18:38:36.62
IV.PIEI.HHN. ML:0.9 0.000013549999999999999 0.84 AML other m 2021-02-15T18:39:01.61
IV.PIEI.HHE. ML:1.2 0.0000231 0.48 AML other m 2021-02-15T18:39:01.29
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