Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 31-05-2021 and time 04:15:53 (UTC) in region 6 km SW Palazzuolo sul Senio (FI)

A magnitude ML 1.7 earthquake occured in region: 6 km SW Palazzuolo sul Senio (FI), on

  • 31-05-2021 04:15:53 (UTC)
  • 31-05-2021 06:15:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0770, 11.5010 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
Palazzuolo sul Senio FI 6 1154 1154
Marradi FI 9 3139 4293
Firenzuola FI 11 4726 9019
Castel del Rio BO 15 1246 10265
Vicchio FI 16 8044 18309
Borgo San Lorenzo FI 16 18211 36520
Scarperia e San Piero FI 19 12217 48737
Casola Valsenio RA 19 2617 51354
San Godenzo FI 19 1167 52521
Tredozio FC 20 1212 53733

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SW of Imola (69797 inhabitants)
38 Km SW of Faenza (58541 inhabitants)
39 Km NE of Prato (191150 inhabitants)
39 Km NE of Firenze (382808 inhabitants)
44 Km NE of Scandicci (50609 inhabitants)
46 Km W of Forlì (117913 inhabitants)
48 Km S of Bologna (386663 inhabitants)
49 Km E of Pistoia (90315 inhabitants)
60 Km W of Cesena (96758 inhabitants)
67 Km SW of Ravenna (159116 inhabitants)
74 Km NW of Arezzo (99543 inhabitants)
78 Km SE of Modena (184973 inhabitants)
84 Km E of Lucca (89046 inhabitants)
85 Km S of Ferrara (133155 inhabitants)
85 Km W of Rimini (147750 inhabitants)
85 Km N of Siena (53903 inhabitants)
92 Km SE of Carpi (70699 inhabitants)
97 Km E of Pisa (89158 inhabitants)
98 Km SE of Reggio nell'Emilia (171345 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 1.7 2021-05-31
04:15:53		 44.0773 11.5008 8 2021-12-29
11:12:05		 Bollettino Sismico Italiano INGV 91385981
Reviewed
Rev100 		ML 1.7 2021-05-31
04:15:53		 44.0813 11.5033 9 2021-05-31
04:22:49		 Sala Sismica INGV-Roma 90650871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-31 04:15:53 ± 0.05
Latitude 44.0773 ± 0.0027
Longitude 11.5008 ± 0.0038
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91385981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 27
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 168
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 44
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 31
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.65021
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 91385981
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-16 09:56:57

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 90650871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-31 04:22:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NDIM.HHZ. 2021-05-31T04:16:23.08 3.0 undecidable manual S -2.61 0
IV.MCIV.CHZ. 2021-05-31T04:16:17.46 3.0 undecidable manual P -0.25 0
IV.BDI.HHZ. 2021-05-31T04:16:16.53 0.6 undecidable manual S 269 72.1722 50 0.31 44
IV.CRMI.HNN. 2021-05-31T04:16:11.07 0.6 undecidable manual S 233 52.1034 50 0.21 46
IV.ASQU.HHZ. 2021-05-31T04:16:07.56 0.3 undecidable manual S 143 38.7279 50 0.26 70
IV.IMOL.EHZ. 2021-05-31T04:16:07.20 0.3 undecidable manual S 31 36.741 50 0.43 68
IV.CSNT.HHZ. 2021-05-31T04:16:06.28 0.1 undecidable manual P 194 69.0753 50 0.02 93
IV.BDI.HHZ. 2021-05-31T04:16:06.42 0.1 undecidable manual P 269 72.1722 50 -0.32 87
IV.MPPT.EHZ. 2021-05-31T04:16:06.44 0.3 undecidable manual S 248 35.3424 102 0.11 73
IV.CRE.HHZ. 2021-05-31T04:16:05.07 0.3 undecidable manual P 144 62.3931 50 -0.15 69
IV.SFI.EHZ. 2021-05-31T04:16:05.85 0.3 undecidable manual S 125 33.6441 103 0.1 73
IT.FIE.HGE. 2021-05-31T04:16:05.97 0.3 undecidable manual S 209 34.2435 103 0.03 75
IV.FNVD.HHZ. 2021-05-31T04:16:04.88 0.3 undecidable manual S 289 31.746 104 -0.23 72
IV.BRIS.HHZ. 2021-05-31T04:16:03.54 0.3 undecidable manual S 52 26.751 106 0.1 74
IV.ZCCA.HNN. 2021-05-31T04:16:03.52 0.1 undecidable manual P 306 51.6039 50 -0.04 96
IV.MOCL.EHZ. 2021-05-31T04:16:03.65 0.3 undecidable manual S 253 26.751 106 0.21 73
IV.MTRZ.HHZ. 2021-05-31T04:16:03.87 0.6 undecidable manual S 347 26.8509 106 0.4 47
IV.CRMI.HNN. 2021-05-31T04:16:03.28 0.1 undecidable manual P 233 52.1034 50 -0.36 90
IV.RUFI.EHZ. 2021-05-31T04:16:03.64 0.6 undecidable manual S 179 26.5512 106 0.26 48
IV.ASQU.HHZ. 2021-05-31T04:16:01.38 0.3 undecidable manual P 143 38.7279 50 -0.2 71
IV.IMOL.EHZ. 2021-05-31T04:16:01.52 0.3 undecidable manual P 31 36.741 50 0.24 71
IT.FIE.HGE. 2021-05-31T04:16:00.69 0.1 undecidable manual P 209 34.2435 103 -0.11 98
IV.MPPT.EHZ. 2021-05-31T04:16:00.74 0.3 undecidable manual P 248 35.3424 102 -0.28 71
IV.SFI.EHZ. 2021-05-31T04:16:00.37 0.3 undecidable manual P 125 33.6441 103 -0.32 70
IV.LMD.HHZ. 2021-05-31T04:16:00.05 0.3 undecidable manual S 90 16.4724 115 -0.04 77
IV.MTRZ.HHZ. 2021-05-31T04:15:59.38 0.3 undecidable manual P 347 26.8509 106 0.01 76
IV.RUFI.EHZ. 2021-05-31T04:15:59.56 0.1 positive manual P 179 26.5512 106 0.24 96
IV.BRIS.HHZ. 2021-05-31T04:15:59.15 0.1 undecidable manual P 52 26.751 106 -0.2 97
IV.FNVD.HHZ. 2021-05-31T04:15:59.87 0.1 positive manual P 289 31.746 104 -0.45 91
IV.MOCL.EHZ. 2021-05-31T04:15:59.42 0.1 positive manual P 253 26.751 106 0.06 100
IV.SEI.HHZ. 2021-05-31T04:15:58.97 0.3 undecidable manual S 257 11.5773 124 0.34 73
IV.LMD.HHZ. 2021-05-31T04:15:57.26 0.1 undecidable manual P 90 16.4724 115 -0.16 100
IV.SEI.HHZ. 2021-05-31T04:15:56.80 0.1 positive manual P 257 11.5773 124 0.22 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:1.7 0.0005394999999999999 0.9 AML other m 2021-05-31T04:16:00.33
IV.SEI.HHN. ML:2.2 0.001895 0.26 AML other m 2021-05-31T04:16:00.89
IV.SEI.HHE. ML:2.1 0.00158 0.36 AML other m 2021-05-31T04:16:01.46
IV.LMD.HHE. ML:1.7 0.0005114999999999999 1.52 AML other m 2021-05-31T04:16:02.15
IV.BRIS.HHN. ML:2.2 0.0008485000000000001 0.24 AML other m 2021-05-31T04:16:03.82
IV.BRIS.HHE. ML:2.0 0.0004985 0.16 AML other m 2021-05-31T04:16:03.83
IV.RUFI.EHE. ML:1.6 0.00020549999999999998 0.96 AML other m 2021-05-31T04:16:04.08
IV.MOCL.EHN. ML:1.7 0.000309 0.14 AML other m 2021-05-31T04:16:04.42
IV.MOCL.EHE. ML:1.8 0.00035999999999999997 0.14 AML other m 2021-05-31T04:16:04.72
IV.MTRZ.HNE. ML:2.0 0.000564 0.98 AML other m 2021-05-31T04:16:04.85
IV.MTRZ.HHE. ML:2.0 0.00051 0.98 AML other m 2021-05-31T04:16:04.36
IV.FNVD.HHE. ML:2.3 0.0008565000000000001 0.26 AML other m 2021-05-31T04:16:05.54
IV.FNVD.HHN. ML:2.2 0.000749 0.34 AML other m 2021-05-31T04:16:05.55
IV.SFI.EHE. ML:1.4 0.00010899999999999998 0.3 AML other m 2021-05-31T04:16:06.33
IV.RUFI.EHN. ML:1.4 0.00013309999999999998 0.34 AML other m 2021-05-31T04:16:06.46
IV.SFI.EHN. ML:1.5 0.0001375 1.18 AML other m 2021-05-31T04:16:06.34
IV.MPPT.EHN. ML:1.4 0.0001114 0.5 AML other m 2021-05-31T04:16:06.69
IV.MPPT.EHE. ML:1.3 0.0000854 1.42 AML other m 2021-05-31T04:16:07.13
IV.ASQU.HHE. ML:1.6 0.0001465 1.54 AML other m 2021-05-31T04:16:08.95
IV.ASQU.HHN. ML:1.6 0.00013015 1.46 AML other m 2021-05-31T04:16:08.96
IV.MTRZ.HHN. ML:1.8 0.000343 0.76 AML other m 2021-05-31T04:16:12.11
IV.MTRZ.HNN. ML:1.9 0.0004125 0.8 AML other m 2021-05-31T04:16:12.11
IV.BDI.HHN. ML:1.5 0.00005405 1.2 AML other m 2021-05-31T04:16:17.05
IV.CRE.HHN. ML:1.6 0.0000873 0.94 AML other m 2021-05-31T04:16:19.82
IV.CRE.HHE. ML:1.2 0.000031899999999999996 0.62 AML other m 2021-05-31T04:16:19.61
IV.BDI.HHE. ML:1.4 0.00004375 1.12 AML other m 2021-05-31T04:16:20.29
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