Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 22-02-2021 and time 14:40:27 (Italy) in region 4 km N Tredozio (FC)

A magnitude ML 1.5 earthquake occured in region: 4 km N Tredozio (FC), on

  • 22-02-2021 13:40:27 (UTC)
  • 22-02-2021 14:40:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1200, 11.7390 at 26 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Tredozio FC 4 1212 1212
Modigliana FC 6 4560 5772
Rocca San Casciano FC 11 1910 7682
Portico e San Benedetto FC 11 756 8438
Marradi FI 11 3139 11577
Brisighella RA 12 7639 19216
Dovadola FC 12 1653 20869
Casola Valsenio RA 15 2617 23486
Palazzuolo sul Senio FI 15 1154 24640
Premilcuore FC 16 799 25439
Riolo Terme RA 18 5720 31159
Castrocaro Terme e Terra del Sole FC 18 6426 37585
Galeata FC 19 2516 40101
Predappio FC 20 6346 46447

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Faenza (58541 inhabitants)
26 Km S of Imola (69797 inhabitants)
27 Km W of Forlì (117913 inhabitants)
40 Km W of Cesena (96758 inhabitants)
50 Km SW of Ravenna (159116 inhabitants)
52 Km SE of Bologna (386663 inhabitants)
55 Km NE of Firenze (382808 inhabitants)
58 Km E of Prato (191150 inhabitants)
60 Km NE of Scandicci (50609 inhabitants)
66 Km W of Rimini (147750 inhabitants)
69 Km E of Pistoia (90315 inhabitants)
74 Km N of Arezzo (99543 inhabitants)
80 Km S of Ferrara (133155 inhabitants)
87 Km SE of Modena (184973 inhabitants)
95 Km NE of Siena (53903 inhabitants)
97 Km W of Pesaro (94582 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 2021-02-22
13:40:27		 44.1197 11.7388 26 2021-07-12
16:55:09		 Bollettino Sismico Italiano INGV 89747191
Reviewed
Rev100 		ML 1.5 2021-02-22
13:40:27		 44.1225 11.7368 26 2021-02-22
13:47:54		 Sala Sismica INGV-Roma 87378561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-22 13:40:27 ± 0.23
Latitude 44.1197 ± 0.0063
Longitude 11.7388 ± 0.0113
Depth (km) 26 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89747191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 742
Semi-minor axis of confidence ellipse (meter) 520
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 289
Circular confidence region, given by single value of horizontal uncertainty (meter) 740.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.32645
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 89747191
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-03 18:08:56

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 87378561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-22 13:47:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHE. 2021-02-22T13:40:40.77 0.3 undecidable manual S 210 36.2415 119 0.01 72
IV.RINC.HHZ. 2021-02-22T13:40:39.36 0.3 undecidable manual S 202 27.9498 127 0.45 67
IV.RONT.HHE. 2021-02-22T13:40:39.18 0.6 undecidable manual S 240 28.1496 127 0.23 47
IV.SEI.HHZ. 2021-02-22T13:40:39.43 0.6 undecidable manual S 257 31.1466 124 -0.18 47
IV.VISG.HHZ. 2021-02-22T13:40:38.37 0.3 undecidable manual S 288 25.4523 130 -0.02 74
IV.SFI.EHZ. 2021-02-22T13:40:38.65 0.3 undecidable manual S 160 25.3524 130 0.28 70
IV.BRIS.HHZ. 2021-02-22T13:40:36.60 0.3 undecidable manual S 11 11.877 153 0.51 66
IV.LMD.HHZ. 2021-02-22T13:40:35.21 0.1 undecidable manual S 208 5.2947 167 -0.28 98
IV.MTRZ.HNN. 2021-02-22T13:40:35.41 0.6 undecidable manual P 311 32.9448 122 0.67 41
IV.RUFI.EHE. 2021-02-22T13:40:35.12 0.3 undecidable manual P 210 36.2415 119 -0.06 71
IV.RONT.HHE. 2021-02-22T13:40:34.18 0.3 undecidable manual P 240 28.1496 127 0.05 73
IV.SEI.HHZ. 2021-02-22T13:40:34.46 0.3 undecidable manual P 257 31.1466 124 -0.05 72
IV.SFI.EHZ. 2021-02-22T13:40:33.75 0.1 negative manual P 160 25.3524 130 -0.05 98
IV.RINC.HHZ. 2021-02-22T13:40:33.94 0.1 positive manual P 202 27.9498 127 -0.17 95
IV.VISG.HHZ. 2021-02-22T13:40:33.56 0.3 undecidable manual P 288 25.4523 130 -0.25 70
IV.BRIS.HHZ. 2021-02-22T13:40:32.40 0.1 negative manual P 11 11.877 153 -0.09 100
IV.LMD.HHZ. 2021-02-22T13:40:31.68 0.1 negative manual P 208 5.2947 167 -0.46 93
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:1.8 0.00034 0.34 AML other m 2021-02-22T13:40:35.29
IV.LMD.HHN. ML:1.9 0.0004545 0.28 AML other m 2021-02-22T13:40:35.48
IV.BRIS.HHE. ML:1.4 0.000157 1.36 AML other m 2021-02-22T13:40:36.09
IV.VISG.HHE. ML:1.4 0.0001133 0.36 AML other m 2021-02-22T13:40:38.55
IV.SFI.EHE. ML:1.6 0.000152 1.24 AML other m 2021-02-22T13:40:38.19
IV.VISG.HHN. ML:1.4 0.0001043 0.14 AML other m 2021-02-22T13:40:39.01
IV.BRIS.HHN. ML:1.3 0.00010900000000000002 0.42 AML other m 2021-02-22T13:40:39.37
IV.SFI.EHN. ML:1.6 0.000177 0.68 AML other m 2021-02-22T13:40:39.31
IV.RINC.HHE. ML:1.4 0.00010619999999999999 0.28 AML other m 2021-02-22T13:40:39.75
IV.SEI.HHE. ML:1.6 0.000129 0.3 AML other m 2021-02-22T13:40:40.28
IV.RINC.HHN. ML:1.2 0.00006695000000000001 0.74 AML other m 2021-02-22T13:40:40.85
IV.SEI.HHN. ML:1.7 0.000182 1.14 AML other m 2021-02-22T13:40:40.01
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