Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 24-01-2021 and time 21:33:45 (Italy) in region 4 km S Vernio (PO)

A magnitude ML 1.7 earthquake occured in region: 4 km S Vernio (PO), on

  • 24-01-2021 20:33:45 (UTC)
  • 24-01-2021 21:33:45 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.02, 11.16 at 9 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
Vernio PO 4 6060 6060
Cantagallo PO 5 3105 9165
Barberino di Mugello FI 6 10836 20001
Vaiano PO 7 9895 29896
Castiglione dei Pepoli BO 14 5648 35544
Scarperia e San Piero FI 14 12217 47761
Montemurlo PO 14 18456 66217
Montale PT 15 10737 76954
Vaglia FI 16 5073 82027
Prato PO 16 191150 273177
Sambuca Pistoiese PT 16 1626 274803
Calenzano FI 17 17489 292292
Camugnano BO 18 1885 294177
Agliana PT 18 17525 311702
Castel di Casio BO 19 3448 315150
Borgo San Lorenzo FI 19 18211 333361

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km NE of Prato (191150 inhabitants)
22 Km E of Pistoia (90315 inhabitants)
29 Km N of Firenze (382808 inhabitants)
29 Km N of Scandicci (50609 inhabitants)
55 Km S of Bologna (386663 inhabitants)
57 Km E of Lucca (89046 inhabitants)
58 Km SW of Imola (69797 inhabitants)
65 Km W of Faenza (58541 inhabitants)
70 Km E of Pisa (89158 inhabitants)
72 Km S of Modena (184973 inhabitants)
74 Km W of Forlì (117913 inhabitants)
75 Km E of Viareggio (62467 inhabitants)
79 Km N of Siena (53903 inhabitants)
82 Km E of Massa (69479 inhabitants)
84 Km NW of Arezzo (99543 inhabitants)
86 Km E of Carrara (63133 inhabitants)
86 Km NE of Livorno (159219 inhabitants)
87 Km SE of Reggio nell'Emilia (171345 inhabitants)
87 Km W of Cesena (96758 inhabitants)
88 Km S of Carpi (70699 inhabitants)
94 Km W of Ravenna (159116 inhabitants)
98 Km SW of Ferrara (133155 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.7 2021-01-24
20:33:45		 44.02 11.17 9 2021-01-24
20:40:46		 Sala Sismica INGV-Roma 86543881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-24 20:33:45 ± 0.09
Latitude 44.02 ± 0.01
Longitude 11.17 ± 0.01
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86543881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 615
Semi-minor axis of confidence ellipse (meter) 368
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 15
Circular confidence region, given by single value of horizontal uncertainty (meter) 620
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.30757
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 86543881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-24 20:40:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BSSO.HNZ. 2021-01-24T20:35:24.17 3.0 undecidable manual Sn -2.06 0
IV.IVPL.HHZ. 2021-01-24T20:35:17.57 3.0 undecidable manual Pn -0.06 0
IV.MTGR.HHZ. 2021-01-24T20:35:17.61 3.0 negative manual Pn 1.45 0
IV.T0110.HHZ. 2021-01-24T20:35:16.18 3.0 undecidable manual Sg 12.34 0
IV.CIMA.HNZ. 2021-01-24T20:34:49.37 3.0 undecidable manual Sn 3.4 0
IV.RIBO.EHZ.01 2021-01-24T20:34:23.57 3.0 undecidable manual S -1.98 0
IV.FREG.EHZ. 2021-01-24T20:34:15.48 3.0 positive manual Pg 4.06 0
IV.RUFI.EHZ. 2021-01-24T20:33:56.88 0.6 undecidable manual S 126 0.3076 50 -0.52 43
GU.POPM.HHE. 2021-01-24T20:33:56.96 0.3 undecidable manual S 275 0.2941 50 -0.06 71
IV.PII.HHZ. 2021-01-24T20:33:56.66 3.0 positive manual P 3.46 0
IV.RONT.HHZ. 2021-01-24T20:33:54.14 0.3 undecidable manual S 98 0.1943 114 0.51 66
GU.POPM.HHE. 2021-01-24T20:33:52.10 0.1 undecidable manual P 275 0.2941 50 -0.04 95
IV.FNVD.HHN. 2021-01-24T20:33:52.03 0.1 undecidable manual S 348 0.1511 119 -0.11 96
IV.RUFI.EHZ. 2021-01-24T20:33:52.21 0.3 undecidable manual P 126 0.3076 50 -0.15 69
IV.SEI.HHZ. 2021-01-24T20:33:51.57 0.1 undecidable manual S 76 0.143 121 -0.31 92
IT.FIE.HGE. 2021-01-24T20:33:50.99 0.3 undecidable manual P 156 0.232 110 0.03 72
IV.RONT.HHZ. 2021-01-24T20:33:50.55 0.1 undecidable manual P 98 0.1943 114 0.36 90
IV.MPPT.EHZ. 2021-01-24T20:33:50.09 0.3 undecidable manual S 221 0.0818 136 0.08 73
IV.SEI.HHZ. 2021-01-24T20:33:49.22 0.1 undecidable manual P 76 0.143 121 0.05 97
IV.FNVD.HHN. 2021-01-24T20:33:49.56 0.1 undecidable manual P 348 0.1511 119 0.24 93
IV.MPPT.EHZ. 2021-01-24T20:33:48.31 0.1 undecidable manual P 221 0.0818 136 0.22 95
IV.MOCL.EHZ. 2021-01-24T20:33:48.32 0.1 undecidable manual S 143 0.0189 168 -0.49 91
IV.MOCL.EHZ. 2021-01-24T20:33:47.37 0.1 undecidable manual P 143 0.0189 168 -0.03 100
IV.FIU.EHZ. 2021-01-24T20:33:47.80 3.0 positive manual P -1.33 0
IV.NDIM.HHZ. 2021-01-24T20:33:46.65 3.0 negative manual P -2.79 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOCL.EHE. ML:0 0.00238 0.24 AML other m 2021-01-24T20:33:48.38
IV.MOCL.EHN. ML:0 0.001655 0.08 AML other m 2021-01-24T20:33:48.41
IV.SEI.HHE. ML:1.4 0.00023136335 0.256 AML other m 2021-01-24T20:33:51.66
IV.SEI.HHN. ML:1.7 0.00042665175 0.2048 AML other m 2021-01-24T20:33:52.63
IV.RONT.HHE. ML:1.7 0.00036358815 0.1664 AML other m 2021-01-24T20:33:55.49
IV.RONT.HHN. ML:1.8 0.0004495278 0.1792 AML other m 2021-01-24T20:33:55.83
IV.RUFI.EHE. ML:0.6 1.5008745E-5 0.3584 AML other m 2021-01-24T20:33:57.36
IV.RUFI.EHN. ML:0.6 1.5574635E-5 0.1792 AML other m 2021-01-24T20:33:57.04
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download