Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 23-04-2021 and time 18:30:45 (UTC) in region 5 km SE Budrio (BO)

A magnitude ML 1.9 earthquake occured in region: 5 km SE Budrio (BO), on

  • 23-04-2021 18:30:45 (UTC)
  • 23-04-2021 20:30:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4950, 11.5590 at 52 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
Budrio BO 5 18412 18412
Medicina BO 7 16739 35151
Castenaso BO 7 14925 50076
Ozzano dell'Emilia BO 8 13596 63672
Castel San Pietro Terme BO 11 20811 84483
Granarolo dell'Emilia BO 11 11910 96393
Castel Guelfo di Bologna BO 12 4455 100848
San Lazzaro di Savena BO 12 32065 132913
Minerbio BO 16 8793 141706
Dozza BO 16 6652 148358
Molinella BO 17 15797 164155
Baricella BO 17 6951 171106
Bologna BO 17 386663 557769
Castel Maggiore BO 18 18231 576000
Bentivoglio BO 19 5469 581469
Imola BO 20 69797 651266

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km E of Bologna (386663 inhabitants)
20 Km NW of Imola (69797 inhabitants)
35 Km NW of Faenza (58541 inhabitants)
38 Km S of Ferrara (133155 inhabitants)
49 Km NW of Forlì (117913 inhabitants)
52 Km W of Ravenna (159116 inhabitants)
53 Km E of Modena (184973 inhabitants)
62 Km SE of Carpi (70699 inhabitants)
67 Km S of Rovigo (51867 inhabitants)
67 Km NW of Cesena (96758 inhabitants)
77 Km E of Reggio nell'Emilia (171345 inhabitants)
78 Km NE of Prato (191150 inhabitants)
81 Km NE of Pistoia (90315 inhabitants)
84 Km NE of Firenze (382808 inhabitants)
87 Km NE of Scandicci (50609 inhabitants)
94 Km NW of Rimini (147750 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 1.9 2021-04-23
18:30:45		 44.4948 11.5592 52 2021-07-12
16:55:15		 Bollettino Sismico Italiano INGV 91255411
Reviewed
Rev100 		ML 1.9 2021-04-23
18:30:44		 44.4423 11.5708 58 2021-04-23
18:43:21		 Sala Sismica INGV-Roma 89410701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-23 18:30:45 ± 0.21
Latitude 44.4948 ± 0.0108
Longitude 11.5592 ± 0.0151
Depth (km) 52 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91255411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1223
Semi-minor axis of confidence ellipse (meter) 580
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 306
Circular confidence region, given by single value of horizontal uncertainty (meter) 1220.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 31
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.15288
Epicentral distance of station farthest from the epicenter (degree) 0.87054
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 91255411
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-14 07:00:04

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 32
Type of magnitude ML
Reference to an origin 89410701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-23 18:43:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.POPM.HHZ. 2021-04-23T18:31:11.32 0.6 undecidable manual S 232 80.9523 109 0.32 44
IV.MPPT.EHN. 2021-04-23T18:31:09.14 0.6 undecidable manual S 212 70.2741 113 0.29 44
IV.RINC.HHN. 2021-04-23T18:31:08.65 0.6 undecidable manual S 177 67.5768 114 0.33 43
IV.MOCL.EHZ. 2021-04-23T18:31:07.53 0.6 undecidable manual S 209 62.0934 117 0.28 45
IV.ZCCA.HHZ. 2021-04-23T18:31:05.06 0.6 undecidable manual S 251 48.8178 126 0.25 46
IV.FNVD.HHZ. 2021-04-23T18:31:04.23 0.6 undecidable manual S 224 50.1165 125 -0.81 38
IV.LMD.HHZ. 2021-04-23T18:31:04.19 0.6 undecidable manual S 166 47.7189 127 -0.44 45
IV.BRIS.HHZ. 2021-04-23T18:31:02.36 0.3 undecidable manual S 151 34.2435 139 -0.1 73
IV.MTRZ.HHE. 2021-04-23T18:31:01.25 0.6 undecidable manual S 208 22.8549 151 0.21 47
IV.TEOL.HHZ. 2021-04-23T18:31:01.90 0.6 undecidable manual P 5 96.6255 104 -0.32 40
IV.ASQU.HHE. 2021-04-23T18:31:01.03 0.1 positive manual P 167 79.5648 109 0.84 73
IV.BDI.HHZ. 2021-04-23T18:31:01.95 0.1 undecidable manual P 238 90.243 106 0.49 83
GU.POPM.HHZ. 2021-04-23T18:31:00.00 0.3 undecidable manual P 232 80.9523 109 -0.35 62
IV.IMOL.EHZ. 2021-04-23T18:31:00.88 0.3 undecidable manual S 136 20.868 153 0.04 72
IV.FIU.EHZ. 2021-04-23T18:31:00.55 0.3 undecidable manual S 342 16.9719 158 0.05 73
IV.RINC.HHN. 2021-04-23T18:30:59.03 0.3 undecidable manual P 177 67.5768 114 0.23 67
IV.RUFI.EHZ. 2021-04-23T18:30:59.76 0.3 undecidable manual P 183 72.9714 112 0.34 65
IV.SFI.EHZ. 2021-04-23T18:30:59.23 0.1 negative manual P 161 69.375 113 0.23 89
IV.MPPT.EHN. 2021-04-23T18:30:59.35 0.1 negative manual P 212 70.2741 113 0.24 90
IV.CAVE.HHZ. 2021-04-23T18:30:58.50 0.6 undecidable manual P 313 60.1953 118 0.53 43
IV.ZCCA.HHZ. 2021-04-23T18:30:57.28 0.1 undecidable manual P 251 48.8178 126 0.51 88
IV.MOCL.EHZ. 2021-04-23T18:30:57.86 0.6 undecidable manual P 209 62.0934 117 -0.32 43
IV.RONT.HHZ. 2021-04-23T18:30:57.76 0.1 negative manual P 190 56.499 120 0.19 92
IV.LMD.HHZ. 2021-04-23T18:30:56.17 0.1 undecidable manual P 166 47.7189 127 -0.49 88
IV.SEI.HHZ. 2021-04-23T18:30:56.32 0.1 positive manual P 198 51.4152 124 -0.71 79
IV.FNVD.HHZ. 2021-04-23T18:30:56.03 0.1 undecidable manual P 224 50.1165 125 -0.88 73
IV.BRIS.HHZ. 2021-04-23T18:30:55.09 0.1 negative manual P 151 34.2435 139 -0.33 94
IV.FIU.EHZ. 2021-04-23T18:30:54.08 0.1 positive manual P 342 16.9719 158 -0.2 99
IV.CMPO.HNE. 2021-04-23T18:30:54.79 0.6 undecidable manual P 64 21.6672 152 0.26 47
IV.MTRZ.HHE. 2021-04-23T18:30:54.18 0.1 undecidable manual P 208 22.8549 151 -0.42 93
IV.IMOL.EHZ. 2021-04-23T18:30:54.32 0.1 undecidable manual P 136 20.868 153 -0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIU.EHN. ML:2.6 0.0009195 0.24 AML other m 2021-04-23T18:31:00.73
IV.FIU.EHE. ML:2.4 0.0006756313999999999 0.2816 AML other m 2021-04-23T18:31:00.91
IV.BRIS.HHE. ML:1.8 0.000122 0.54 AML other m 2021-04-23T18:31:02.47
IV.BRIS.HHN. ML:1.6 0.000091973495 0.2432 AML other m 2021-04-23T18:31:03.07
IV.FNVD.HHE. ML:1.7 0.000082309565 0.1792 AML other m 2021-04-23T18:31:04.49
IV.FNVD.HHN. ML:1.7 0.00007419133 0.1408 AML other m 2021-04-23T18:31:04.42
IV.LMD.HHN. ML:1.9 0.00011904134499999999 0.256 AML other m 2021-04-23T18:31:04.72
IV.LMD.HHE. ML:2.0 0.0001605 0.42 AML other m 2021-04-23T18:31:04.75
IV.ZCCA.HHN. ML:1.7 0.00008861132499999998 0.3328 AML other m 2021-04-23T18:31:06.18
IV.ZCCA.HHE. ML:1.6 0.000068 1.66 AML other m 2021-04-23T18:31:06.05
IV.RONT.HHE. ML:2.0 0.000163 0.36 AML other m 2021-04-23T18:31:06.91
IV.CAVE.HHN. ML:2.2 0.0002191159 0.384 AML other m 2021-04-23T18:31:07.37
IV.CAVE.HHE. ML:2.1 0.00017258845 0.2432 AML other m 2021-04-23T18:31:08.17
IV.SEI.HHN. ML:2.2 0.000241 0.36 AML other m 2021-04-23T18:31:09.42
IV.RONT.HHN. ML:1.9 0.000129 0.32 AML other m 2021-04-23T18:31:09.44
IV.SFI.EHE. ML:1.5 0.00004226845 0.3456 AML other m 2021-04-23T18:31:10.27
IV.SEI.HHE. ML:1.7 0.00008494999999999999 0.38 AML other m 2021-04-23T18:31:10.23
IV.MOCL.EHE. ML:1.8 0.00008515000000000001 0.26 AML other m 2021-04-23T18:31:10.32
IV.SFI.EHN. ML:1.7 0.00006489299500000001 0.256 AML other m 2021-04-23T18:31:10.65
IV.MOCL.EHN. ML:1.7 0.000064707655 0.4992 AML other m 2021-04-23T18:31:10.00
IV.BDI.HHE. ML:1.7 0.00004747587 0.256 AML other m 2021-04-23T18:31:14.23
IV.BDI.HHN. ML:1.7 0.0000519 0.38 AML other m 2021-04-23T18:31:15.44
IV.TEOL.HHN. ML:2.0 0.00008144552 0.32 AML other m 2021-04-23T18:31:19.51
IV.TEOL.HHE. ML:1.9 0.000076043395 0.3456 AML other m 2021-04-23T18:31:21.75
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