Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 22-04-2021 and time 01:46:31 (UTC) in region 4 km W Palazzuolo sul Senio (FI)

A magnitude ML 2.0 earthquake occured in region: 4 km W Palazzuolo sul Senio (FI), on

  • 22-04-2021 01:46:31 (UTC)
  • 22-04-2021 03:46:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1020, 11.5050 at 5 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
Palazzuolo sul Senio FI 4 1154 1154
Marradi FI 9 3139 4293
Firenzuola FI 10 4726 9019
Castel del Rio BO 12 1246 10265
Casola Valsenio RA 17 2617 12882
Fontanelice BO 18 1943 14825
Borgo San Lorenzo FI 19 18211 33036
Vicchio FI 19 8044 41080
Tredozio FC 19 1212 42292
Monghidoro BO 20 3749 46041

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Imola (69797 inhabitants)
37 Km SW of Faenza (58541 inhabitants)
41 Km NE of Prato (191150 inhabitants)
42 Km NE of Firenze (382808 inhabitants)
45 Km W of Forlì (117913 inhabitants)
46 Km S of Bologna (386663 inhabitants)
46 Km NE of Scandicci (50609 inhabitants)
51 Km E of Pistoia (90315 inhabitants)
59 Km W of Cesena (96758 inhabitants)
66 Km SW of Ravenna (159116 inhabitants)
76 Km SE of Modena (184973 inhabitants)
77 Km NW of Arezzo (99543 inhabitants)
82 Km S of Ferrara (133155 inhabitants)
85 Km W of Rimini (147750 inhabitants)
85 Km E of Lucca (89046 inhabitants)
88 Km N of Siena (53903 inhabitants)
90 Km SE of Carpi (70699 inhabitants)
96 Km SE of Reggio nell'Emilia (171345 inhabitants)
98 Km E of Pisa (89158 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 2.0 2021-04-22
01:46:31		 44.1022 11.5052 5 2021-07-12
16:55:10		 Bollettino Sismico Italiano INGV 90021301
Reviewed
Rev100 		ML 2.0 2021-04-22
01:46:31		 44.1023 11.4995 5 2021-04-22
01:52:49		 Sala Sismica INGV-Roma 89344921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-22 01:46:31 ± 0.08
Latitude 44.1022 ± 0.0036
Longitude 11.5052 ± 0.0050
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90021301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 440
Semi-minor axis of confidence ellipse (meter) 29
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 210
Circular confidence region, given by single value of horizontal uncertainty (meter) 440.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.10072
Epicentral distance of station farthest from the epicenter (degree) 0.84087
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 44
Type of magnitude ML
Reference to an origin 90021301
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-22 13:49:13

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 46
Type of magnitude ML
Reference to an origin 89344921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-22 01:52:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PII.HHZ. 2021-04-22T01:46:58.87 0.6 undecidable manual S 242 88.9443 50 -0.49 40
IV.CPGN.EHZ. 2021-04-22T01:46:56.07 0.6 undecidable manual S 117 73.1712 50 0.93 34
IV.CAFI.HHZ. 2021-04-22T01:46:48.78 0.3 undecidable manual P 157 93.3399 50 0.36 61
IV.PII.HHZ. 2021-04-22T01:46:47.77 0.6 undecidable manual P 242 88.9443 50 0.03 44
IV.ASQU.HHZ. 2021-04-22T01:46:45.61 0.6 undecidable manual S 146 40.8258 97 -0.54 43
IV.CPGN.EHZ. 2021-04-22T01:46:45.92 0.6 undecidable manual P 117 73.1712 50 0.61 39
IV.MPPT.EHZ. 2021-04-22T01:46:44.76 0.6 undecidable manual S 244 36.741 98 -0.01 48
IV.BDI.HHZ. 2021-04-22T01:46:44.37 0.6 undecidable manual P 267 72.5718 50 -0.85 35
IV.CSNT.HHZ. 2021-04-22T01:46:44.62 0.6 undecidable manual P 194 71.8725 50 -0.49 41
IV.SFI.EHZ. 2021-04-22T01:46:43.86 0.3 undecidable manual S 129 34.9428 99 -0.3 68
IV.FNVD.HHZ. 2021-04-22T01:46:42.82 0.6 undecidable manual S 284 31.2465 100 -0.07 48
IV.ZCCA.HHZ. 2021-04-22T01:46:42.29 0.1 positive manual P 303 50.3163 50 0.51 85
IV.RUFI.EHZ. 2021-04-22T01:46:42.15 0.3 undecidable manual S 179 29.3484 100 -0.07 73
IV.BRSN.EHZ. 2021-04-22T01:46:41.94 0.3 undecidable manual P 66 50.0166 50 0.2 68
IV.RINC.HHZ. 2021-04-22T01:46:41.04 0.3 undecidable manual S 161 25.2525 102 0.2 71
IV.MOCL.EHZ. 2021-04-22T01:46:41.94 0.6 undecidable manual S 247 28.0497 101 0.16 48
IV.BRIS.HHZ. 2021-04-22T01:46:41.12 0.3 undecidable manual S 57 24.8529 102 0.42 68
IV.MTRZ.HHZ. 2021-04-22T01:46:40.70 0.3 undecidable manual S 345 24.2535 102 0.21 71
IV.ASQU.HHZ. 2021-04-22T01:46:39.45 0.3 undecidable manual P 146 40.8258 97 -0.67 61
IV.SFI.EHZ. 2021-04-22T01:46:38.37 0.3 undecidable manual P 129 34.9428 99 -0.6 63
IV.LMD.HHZ. 2021-04-22T01:46:38.01 0.3 undecidable manual S 100 16.3725 108 0.17 73
IV.MPPT.EHZ. 2021-04-22T01:46:38.76 0.1 positive manual P 244 36.741 98 -0.56 85
IV.IMOL.EHZ. 2021-04-22T01:46:38.26 0.6 undecidable manual P 33 34.2435 99 -0.56 43
IV.RUFI.EHZ. 2021-04-22T01:46:37.64 0.1 positive manual P 179 29.3484 100 -0.21 94
IV.SEI.HHZ. 2021-04-22T01:46:37.61 0.6 undecidable manual S 246 12.876 113 0.91 38
IV.FNVD.HHZ. 2021-04-22T01:46:37.73 0.1 positive manual P 284 31.2465 100 -0.51 88
IV.MTRZ.HHZ. 2021-04-22T01:46:37.06 0.3 undecidable manual P 345 24.2535 102 0.21 71
IV.RONT.HHZ. 2021-04-22T01:46:37.50 0.3 undecidable manual S 206 13.3755 112 0.63 65
IV.RINC.HHZ. 2021-04-22T01:46:37.15 0.1 negative manual P 161 25.2525 102 0.1 97
IV.MOCL.EHZ. 2021-04-22T01:46:37.43 0.1 positive manual P 247 28.0497 101 -0.16 95
IV.BRIS.HHZ. 2021-04-22T01:46:36.81 0.1 positive manual P 57 24.8529 102 -0.16 96
IV.VISG.HHZ. 2021-04-22T01:46:35.97 0.3 undecidable manual S 330 11.1777 116 -0.2 73
IV.LMD.HHZ. 2021-04-22T01:46:35.24 0.1 positive manual P 100 16.3725 108 -0.08 99
IV.RONT.HHZ. 2021-04-22T01:46:35.35 0.1 positive manual P 206 13.3755 112 0.59 88
IV.VISG.HHZ. 2021-04-22T01:46:34.30 0.1 undecidable manual P 330 11.1777 116 -0.06 100
IV.SEI.HHZ. 2021-04-22T01:46:34.99 0.1 undecidable manual P 246 12.876 113 0.33 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:2.6 0.006045 0.42 AML other m 2021-04-22T01:46:36.40
IV.VISG.HHN. ML:2.6 0.005665 0.12 AML other m 2021-04-22T01:46:36.41
IV.RONT.HHE. ML:2.7 0.006025 0.26 AML other m 2021-04-22T01:46:39.13
IV.RONT.HHN. ML:2.8 0.00707 0.36 AML other m 2021-04-22T01:46:39.78
IV.LMD.HHN. ML:1.9 0.000768 0.8 AML other m 2021-04-22T01:46:40.49
IV.LMD.HHE. ML:1.9 0.000823 0.26 AML other m 2021-04-22T01:46:40.84
IV.RINC.HHE. ML:2.2 0.000982 0.52 AML other m 2021-04-22T01:46:41.71
IV.RINC.HHN. ML:2.0 0.0006255 1.08 AML other m 2021-04-22T01:46:42.06
IV.MOCL.EHN. ML:1.9 0.00047750000000000006 0.18 AML other m 2021-04-22T01:46:42.75
IV.RUFI.EHE. ML:1.9 0.0004215 1.06 AML other m 2021-04-22T01:46:43.61
IV.FNVD.HHE. ML:2.0 0.0004685 0.68 AML other m 2021-04-22T01:46:43.50
IV.RUFI.EHN. ML:1.7 0.00023549999999999998 0.42 AML other m 2021-04-22T01:46:43.24
IV.FNVD.HHN. ML:2.1 0.000686 0.58 AML other m 2021-04-22T01:46:43.62
IV.MOCL.EHE. ML:2.0 0.000523 1.24 AML other m 2021-04-22T01:46:43.92
IV.SFI.HNN. ML:1.9 0.000314 0.9 AML other m 2021-04-22T01:46:44.20
IV.SFI.EHN. ML:1.8 0.00023750000000000003 0.5 AML other m 2021-04-22T01:46:44.21
IV.MTRZ.HHE. ML:2.2 0.001105 0.52 AML other m 2021-04-22T01:46:45.10
IV.MTRZ.HNE. ML:2.2 0.001063 0.52 AML other m 2021-04-22T01:46:45.36
IV.SFI.HNE. ML:1.9 0.000336 1.04 AML other m 2021-04-22T01:46:45.88
IV.SFI.EHE. ML:1.9 0.000301 1.04 AML other m 2021-04-22T01:46:45.89
IV.BRIS.HHN. ML:2.2 0.0010435000000000002 0.38 AML other m 2021-04-22T01:46:45.48
IV.ASQU.HHE. ML:1.8 0.00022100000000000003 0.24 AML other m 2021-04-22T01:46:45.89
IV.ASQU.HHN. ML:2.0 0.0003185 0.62 AML other m 2021-04-22T01:46:46.05
IV.BRIS.HHE. ML:2.2 0.0009625 0.36 AML other m 2021-04-22T01:46:46.09
IV.MTRZ.HHN. ML:2.1 0.000853 0.72 AML other m 2021-04-22T01:46:46.36
IV.MTRZ.HNN. ML:2.1 0.000868 0.7 AML other m 2021-04-22T01:46:47.72
IV.MPPT.EHE. ML:1.7 0.0002165 0.5 AML other m 2021-04-22T01:46:49.29
IV.MPPT.EHN. ML:1.7 0.000201 0.96 AML other m 2021-04-22T01:46:49.17
IV.IMOL.HNN. ML:2.2 0.0007149999999999999 0.34 AML other m 2021-04-22T01:46:50.73
IV.BRSN.EHE. ML:2.5 0.000934 0.24 AML other m 2021-04-22T01:46:52.43
IV.BRSN.HNE. ML:2.6 0.00103 0.24 AML other m 2021-04-22T01:46:52.44
IV.BRSN.EHN. ML:2.5 0.000822 0.22 AML other m 2021-04-22T01:46:52.30
IV.BRSN.HNN. ML:2.5 0.0008115 0.22 AML other m 2021-04-22T01:46:52.30
IV.IMOL.HNE. ML:2.2 0.000718 0.96 AML other m 2021-04-22T01:46:54.53
IV.ZCCA.HHN. ML:1.4 0.00006610000000000001 1.02 AML other m 2021-04-22T01:46:57.13
IV.CSNT.HHE. ML:2.1 0.000214 0.62 AML other m 2021-04-22T01:46:57.80
IV.CPGN.EHE. ML:1.8 0.00010025000000000001 0.48 AML other m 2021-04-22T01:46:59.43
IV.CSNT.HHN. ML:1.9 0.00013350000000000002 1.38 AML other m 2021-04-22T01:46:59.98
IV.PII.HHE. ML:2.1 0.00016499999999999997 1.38 AML other m 2021-04-22T01:47:00.94
IV.PII.HHN. ML:2.0 0.0001225 0.3 AML other m 2021-04-22T01:47:03.46
IV.CAFI.HHE. ML:1.6 0.00003855 1.04 AML other m 2021-04-22T01:47:04.29
IV.ZCCA.HHE. ML:1.4 0.00007744999999999999 1.12 AML other m 2021-04-22T01:47:05.19
IV.CAFI.HHN. ML:1.4 0.000030100000000000003 0.44 AML other m 2021-04-22T01:47:06.25
IV.CPGN.EHN. ML:1.6 0.0000722 0.8 AML other m 2021-04-22T01:47:08.81
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
Waveforms Seismic signals in miniseed + resp format Download