Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 19-03-2021 and time 20:18:51 (UTC) in region 6 km SW Tredozio (FC)

A magnitude ML 1.4 earthquake occured in region: 6 km SW Tredozio (FC), on

  • 19-03-2021 20:18:51 (UTC)
  • 19-03-2021 21:18:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0400, 11.6970 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
Tredozio FC 6 1212 1212
Portico e San Benedetto FC 7 756 1968
Marradi FI 8 3139 5107
Premilcuore FC 9 799 5906
Rocca San Casciano FC 12 1910 7816
San Godenzo FI 14 1167 8983
Palazzuolo sul Senio FI 14 1154 10137
Modigliana FC 15 4560 14697
Galeata FC 18 2516 17213
Dovadola FC 18 1653 18866
Civitella di Romagna FC 20 3786 22652
Santa Sofia FC 20 4136 26788

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Faenza (58541 inhabitants)
34 Km SW of Forlì (117913 inhabitants)
35 Km S of Imola (69797 inhabitants)
45 Km W of Cesena (96758 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
58 Km SE of Bologna (386663 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
65 Km N of Arezzo (99543 inhabitants)
70 Km W of Rimini (147750 inhabitants)
85 Km NE of Siena (53903 inhabitants)
89 Km S of Ferrara (133155 inhabitants)
91 Km SE of Modena (184973 inhabitants)
98 Km E of Lucca (89046 inhabitants)
98 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 1.4 2021-03-19
20:18:51		 44.0395 11.6972 8 2021-07-12
16:55:10		 Bollettino Sismico Italiano INGV 89993461
Reviewed
Rev100 		ML 1.5 2021-03-19
20:18:50		 44.0448 11.7013 8 2021-03-19
20:24:13		 Sala Sismica INGV-Roma 88289801
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-19 20:18:51 ± 0.08
Latitude 44.0395 ± 0.0027
Longitude 11.6972 ± 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 89993461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 310
Semi-minor axis of confidence ellipse (meter) 202
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 259
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 126
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.03867
Epicentral distance of station farthest from the epicenter (degree) 0.37232
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 15
Type of magnitude ML
Reference to an origin 88289801
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-19 20:24:13

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 89993461
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-11 15:20:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOCL.EHZ. 2021-03-19T20:19:04.99 0.3 undecidable manual S 265 41.3253 50 -0.23 69
IV.VISG.HHZ. 2021-03-19T20:19:00.56 0.3 undecidable manual S 308 26.751 107 -0.15 72
IV.RUFI.EHZ. 2021-03-19T20:19:00.69 0.3 undecidable manual S 214 26.9508 107 -0.09 73
IV.SEI.HHZ. 2021-03-19T20:19:00.96 0.6 undecidable manual S 274 27.0507 106 0.14 48
IV.ASQU.HHZ. 2021-03-19T20:19:00.97 0.3 undecidable manual S 165 27.9498 106 -0.15 72
IV.BRIS.HNZ. 2021-03-19T20:18:59.38 0.3 undecidable manual S 15 21.2676 111 0.46 68
IV.MOCL.EHZ. 2021-03-19T20:18:59.41 0.6 undecidable manual P 265 41.3253 50 0.18 46
IV.RONT.HHZ. 2021-03-19T20:18:59.41 0.3 undecidable manual S 256 21.6672 110 0.35 70
IV.RINC.HHZ. 2021-03-19T20:18:58.15 0.3 undecidable manual S 203 18.4704 113 0.14 73
IV.SFI.EHZ. 2021-03-19T20:18:58.38 0.3 undecidable manual S 141 19.1697 113 0.15 73
IV.ASQU.HHZ. 2021-03-19T20:18:56.68 0.1 positive manual P 165 27.9498 106 -0.18 95
IV.VISG.HHZ. 2021-03-19T20:18:56.39 0.1 undecidable manual P 308 26.751 107 -0.23 94
IV.RUFI.EHZ. 2021-03-19T20:18:56.53 0.1 positive manual P 214 26.9508 107 -0.13 96
IV.SEI.HHZ. 2021-03-19T20:18:56.69 1.0 undecidable manual P 274 27.0507 106 0 25
IV.SFI.EHZ. 2021-03-19T20:18:55.25 0.1 positive manual P 141 19.1697 113 0.05 99
IV.RONT.HHZ. 2021-03-19T20:18:55.78 0.1 undecidable manual P 256 21.6672 110 0.11 98
IV.BRIS.HNZ. 2021-03-19T20:18:55.66 0.1 undecidable manual P 15 21.2676 111 0.07 99
IV.RINC.HHZ. 2021-03-19T20:18:55.23 0.1 positive manual P 203 18.4704 113 0.16 97
IV.LMD.HHZ. 2021-03-19T20:18:53.83 0.3 undecidable manual S 11 4.2957 152 -0.36 72
IV.LMD.HHZ. 2021-03-19T20:18:52.72 0.1 negative manual P 11 4.2957 152 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.EHE. ML:1.4 0.00022250000000000001 0.24 AML other m 2021-03-19T20:18:58.65
IV.SFI.HNE. ML:1.4 0.00021217924999999998 0.2048 AML other m 2021-03-19T20:18:58.53
IV.RINC.HHN. ML:1.4 0.0002220805 0.256 AML other m 2021-03-19T20:18:58.61
IV.SFI.HNN. ML:1.3 0.000153128045 0.3968 AML other m 2021-03-19T20:18:59.10
IV.SFI.EHN. ML:1.1 0.00010463925 0.1792 AML other m 2021-03-19T20:18:59.36
IV.RINC.HHE. ML:1.4 0.00022600000000000002 0.36 AML other m 2021-03-19T20:19:00.04
IV.RONT.HHE. ML:1.9 0.00058500385 0.1536 AML other m 2021-03-19T20:19:00.46
IV.RUFI.EHN. ML:1.7 0.00029099999999999997 1.74 AML other m 2021-03-19T20:19:01.97
IV.RUFI.EHE. ML:1.2 0.000099386767 0.3072 AML other m 2021-03-19T20:19:01.14
IV.RONT.HHN. ML:1.8 0.00051844085 0.2176 AML other m 2021-03-19T20:19:01.15
IV.ASQU.HHN. ML:1.8 0.000354 0.24 AML other m 2021-03-19T20:19:01.47
IV.ASQU.HHE. ML:1.5 0.00015929209999999999 0.2304 AML other m 2021-03-19T20:19:01.90
IV.VISG.HHN. ML:1.3 0.000111292545 0.1664 AML other m 2021-03-19T20:19:02.09
IV.VISG.HHE. ML:1.1 0.00006752533 0.256 AML other m 2021-03-19T20:19:02.45
IV.MOCL.EHE. ML:1.1 0.000045436069999999995 0.1664 AML other m 2021-03-19T20:19:05.45
IV.MOCL.EHN. ML:1.4 0.0000759 0.14 AML other m 2021-03-19T20:19:05.46
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