Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 31-10-2020 and time 21:24:40 (Italy) in region 3 km SE Monterenzio (BO)

A magnitude ML 1.5 earthquake occured in region: 3 km SE Monterenzio (BO), on

  • 31-10-2020 20:24:40 (UTC)
  • 31-10-2020 21:24:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.3020, 11.4290 at 25 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
Monterenzio BO 3 6035 6035
Loiano BO 9 4294 10329
Fontanelice BO 11 1943 12272
Pianoro BO 12 17460 29732
Castel del Rio BO 12 1246 30978
Monghidoro BO 13 3749 34727
Monzuno BO 13 6328 41055
Borgo Tossignano BO 13 3288 44343
Casalfiumanese BO 15 3438 47781
Ozzano dell'Emilia BO 16 13596 61377
Castel San Pietro Terme BO 17 20811 82188
Dozza BO 17 6652 88840
Casola Valsenio RA 18 2617 91457
Sasso Marconi BO 18 14735 106192
San Benedetto Val di Sambro BO 18 4315 110507
Marzabotto BO 18 6779 117286
San Lazzaro di Savena BO 19 32065 149351

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Bologna (386663 inhabitants)
24 Km W of Imola (69797 inhabitants)
36 Km W of Faenza (58541 inhabitants)
50 Km W of Forlì (117913 inhabitants)
54 Km NE of Prato (191150 inhabitants)
55 Km SE of Modena (184973 inhabitants)
58 Km NE of Pistoia (90315 inhabitants)
61 Km N of Firenze (382808 inhabitants)
61 Km S of Ferrara (133155 inhabitants)
63 Km W of Ravenna (159116 inhabitants)
64 Km NE of Scandicci (50609 inhabitants)
67 Km W of Cesena (96758 inhabitants)
69 Km SE of Carpi (70699 inhabitants)
77 Km SE of Reggio nell'Emilia (171345 inhabitants)
90 Km NE of Lucca (89046 inhabitants)
90 Km SW of Rovigo (51867 inhabitants)
95 Km W of Rimini (147750 inhabitants)
100 Km NW of Arezzo (99543 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 1.5 2020-10-31
20:24:40		 44.3023 11.4293 25 2021-02-26
14:56:15		 Bollettino Sismico Italiano INGV 86241501
Reviewed
Rev100 		ML 1.5 2020-10-31
20:24:40		 44.2963 11.4248 27 2020-10-31
20:34:56		 Sala Sismica INGV-Roma 84334091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-31 20:24:40 ± 0.24
Latitude 44.3023 ± 0.0117
Longitude 11.4293 ± 0.0138
Depth (km) 25 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86241501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1106
Semi-minor axis of confidence ellipse (meter) 956
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 330
Circular confidence region, given by single value of horizontal uncertainty (meter) 1110.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.49732
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 86241501
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-14 09:09:04

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 84334091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-31 20:34:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ORZI.HHZ. 2020-10-31T20:25:29.09 3.0 undecidable manual Sg -0.2 0
IV.ATMI.HHZ. 2020-10-31T20:25:03.50 3.0 negative manual Pg 0.24 0
IV.RONT.HHZ. 2020-10-31T20:24:53.75 0.3 undecidable manual S 180 34.2435 120 0.25 68
IV.SEI.HHZ. 2020-10-31T20:24:52.21 0.1 undecidable manual S 192 28.0497 126 0.08 95
IV.BRIS.HHZ. 2020-10-31T20:24:52.21 0.3 undecidable manual S 108 28.1496 126 0.07 71
IV.IMOL.EHZ. 2020-10-31T20:24:51.80 0.3 undecidable manual S 76 25.6521 129 0.19 69
IV.RINC.HHZ. 2020-10-31T20:24:50.22 0.6 undecidable manual P 163 48.2184 111 0.12 45
IV.MPPT.EHZ. 2020-10-31T20:24:50.08 0.6 undecidable manual P 215 46.8198 112 0.19 45
IV.SFI.EHZ. 2020-10-31T20:24:50.89 0.3 undecidable manual P 143 55.2003 108 -0.22 66
IV.MOCL.EHZ. 2020-10-31T20:24:48.59 0.6 undecidable manual P 211 38.4282 117 -0.12 46
IV.MTRZ.HNN. 2020-10-31T20:24:48.95 0.3 undecidable manual S 343 1.1988 177 0.49 67
IV.VISG.HHZ. 2020-10-31T20:24:48.76 0.1 undecidable manual S 178 12.5763 150 -0.58 87
IV.RONT.HHZ. 2020-10-31T20:24:48.95 0.1 undecidable manual P 180 34.2435 120 0.81 76
IV.FNVD.HHZ. 2020-10-31T20:24:47.36 0.1 undecidable manual P 239 28.5492 126 -0.05 95
IV.SEI.HHZ. 2020-10-31T20:24:47.20 0.1 undecidable manual P 192 28.0497 126 -0.14 93
IV.IMOL.EHZ. 2020-10-31T20:24:47.21 0.6 undecidable manual P 76 25.6521 129 0.16 46
IV.BRIS.HHZ. 2020-10-31T20:24:46.98 0.1 undecidable manual P 108 28.1496 126 -0.38 89
IV.VISG.HHZ. 2020-10-31T20:24:45.34 0.1 undecidable manual P 178 12.5763 150 -0.39 91
IV.MTRZ.HNN. 2020-10-31T20:24:45.15 0.1 undecidable manual P 343 1.1988 177 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:2.0 0.0005034999999999999 1.64 AML other m 2020-10-31T20:24:48.86
IV.VISG.HHN. ML:1.9 0.00041049999999999995 1.4 AML other m 2020-10-31T20:24:48.23
IV.BRIS.HHN. ML:1.3 0.00008145 0.96 AML other m 2020-10-31T20:24:52.95
IV.SEI.HHN. ML:1.6 0.00014350000000000002 1.58 AML other m 2020-10-31T20:24:52.98
IV.SEI.HHE. ML:1.4 0.000107 0.32 AML other m 2020-10-31T20:24:54.58
IV.BRIS.HHE. ML:1.3 0.0000703 1.56 AML other m 2020-10-31T20:24:54.14
IV.RONT.HHE. ML:1.5 0.00009875 1.76 AML other m 2020-10-31T20:24:55.96
IV.RONT.HHN. ML:1.5 0.00009615 0.56 AML other m 2020-10-31T20:24:55.29
IV.BRIS.HNN. ML:1.5 0.000125504045 0.6272 AML other m 2020-10-31T20:24:52.55
IV.BRIS.HNE. ML:1.2 0.000052747415 0.3584 AML other m 2020-10-31T20:24:52.63
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