Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 31-08-2021 and time 19:29:45 (Italy) in region 3 km NW Castel Bolognese (RA)

A magnitude ML 1.3 earthquake occured in region: 3 km NW Castel Bolognese (RA), on

  • 31-08-2021 17:29:45 (UTC)
  • 31-08-2021 19:29:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3440, 11.7820 at 37 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
Castel Bolognese RA 3 9554 9554
Solarolo RA 5 4488 14042
Imola BO 5 69797 83839
Bagnara di Romagna RA 6 2429 86268
Mordano BO 7 4760 91028
Riolo Terme RA 9 5720 96748
Faenza RA 10 58541 155289
Massa Lombarda RA 12 10653 165942
Dozza BO 12 6652 172594
Sant'Agata sul Santerno RA 13 2862 175456
Castel Guelfo di Bologna BO 13 4455 179911
Lugo RA 14 32390 212301
Cotignola RA 14 7474 219775
Brisighella RA 14 7639 227414
Casalfiumanese BO 14 3438 230852
Castel San Pietro Terme BO 16 20811 251663
Borgo Tossignano BO 17 3288 254951
Bagnacavallo RA 18 16739 271690
Casola Valsenio RA 18 2617 274307
Medicina BO 19 16739 291046
Conselice RA 19 9856 300902
Fusignano RA 20 8222 309124

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km E of Imola (69797 inhabitants)
10 Km NW of Faenza (58541 inhabitants)
25 Km NW of Forlì (117913 inhabitants)
34 Km W of Ravenna (159116 inhabitants)
39 Km E of Bologna (386663 inhabitants)
43 Km NW of Cesena (96758 inhabitants)
56 Km S of Ferrara (133155 inhabitants)
70 Km W of Rimini (147750 inhabitants)
75 Km NE of Prato (191150 inhabitants)
76 Km E of Modena (184973 inhabitants)
76 Km NE of Firenze (382808 inhabitants)
81 Km NE of Scandicci (50609 inhabitants)
81 Km S of Rovigo (51867 inhabitants)
83 Km NE of Pistoia (90315 inhabitants)
86 Km SE of Carpi (70699 inhabitants)
98 Km N of Arezzo (99543 inhabitants)
99 Km E 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 1.3 2021-08-31
17:29:45		 44.3445 11.7822 37 2021-12-29
11:12:53		 Bollettino Sismico Italiano INGV 98503921
Reviewed
Rev100 		ML 1.3 2021-08-31
17:29:45		 44.3162 11.7708 39 2021-08-31
17:44:02		 Sala Sismica INGV-Roma 94882571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 17:29:45 ± 0.34
Latitude 44.3445 ± 0.0144
Longitude 11.7822 ± 0.0239
Depth (km) 37 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98503921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1835
Semi-minor axis of confidence ellipse (meter) 1569
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 61
Circular confidence region, given by single value of horizontal uncertainty (meter) 1840.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 236
Number of associated phases, regardless of their use for origin computation 45
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.79590
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 98503921
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-14 12:06:29

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 94882571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 17:44:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SPS2.HHZ. 2021-08-31T17:31:26.09 3.0 positive manual Pg 11.68 0
IV.RESU.HHZ. 2021-08-31T17:31:23.00 3.0 undecidable manual Pn -3.61 0
IV.TST02.HHZ. 2021-08-31T17:31:22.23 3.0 undecidable manual Sg 8.94 0
IV.SELL.HHZ. 2021-08-31T17:31:20.05 3.0 undecidable manual Pn 0.42 0
IV.TDS.HHZ. 2021-08-31T17:31:17.99 3.0 undecidable manual Pg 7.92 0
IV.EPZF.HHZ. 2021-08-31T17:31:16.88 3.0 undecidable manual Pn -9.62 0
IV.PLLN.EHZ. 2021-08-31T17:31:14.19 3.0 negative manual Pn -8.01 0
CR.STON.BHZ. 2021-08-31T17:31:02.52 3.0 positive manual Pg 12.07 0
IV.TERO.HHZ. 2021-08-31T17:30:55.10 3.0 undecidable manual Sg 2.73 0
IV.RM33.EHZ. 2021-08-31T17:30:54.70 3.0 undecidable manual Sg 3.04 0
IV.SMA1.EHZ. 2021-08-31T17:30:52.77 3.0 undecidable manual Sg 2.87 0
IV.MTRA.EHZ. 2021-08-31T17:30:51.90 3.0 undecidable manual Sg 4.21 0
IV.EUCT.HNZ. 2021-08-31T17:30:49.36 3.0 undecidable manual Sg 6.72 0
IV.MABI.HHZ. 2021-08-31T17:30:37.76 3.0 undecidable manual Sg 3.58 0
IV.TST02.HHZ. 2021-08-31T17:30:36.60 3.0 undecidable manual Pg 4.27 0
IV.LPEL.HHZ. 2021-08-31T17:30:27.49 3.0 undecidable manual Pn -2.91 0
IV.TREG.HNZ. 2021-08-31T17:30:15.18 3.0 undecidable manual Sg -0.76 0
ST.CARE.HNZ. 2021-08-31T17:30:13.92 3.0 undecidable manual Pg 0.07 0
IV.CRMI.HHZ. 2021-08-31T17:30:11.57 0.6 undecidable manual S 227 88.3449 54 0.12 45
IV.MPPT.EHZ. 2021-08-31T17:30:08.23 0.6 undecidable manual S 232 69.7746 54 0.77 38
IV.ASQU.HHE. 2021-08-31T17:30:06.43 0.6 undecidable manual S 179 60.7947 117 1.01 31
IV.RUFI.EHE. 2021-08-31T17:30:05.85 0.6 undecidable manual S 201 60.1953 117 0.56 38
IV.FNVD.HHZ. 2021-08-31T17:30:04.00 0.6 undecidable manual S 250 55.8996 119 -0.28 48
IV.SFI.EHZ. 2021-08-31T17:30:02.92 0.6 undecidable manual S 174 49.0176 123 0.21 45
IV.PII.HHZ. 2021-08-31T17:30:01.01 3.0 negative manual Pn -5.28 0
IV.SEI.HHZ. 2021-08-31T17:30:01.97 0.6 undecidable manual S 226 46.62 125 -0.2 49
IV.CRMI.HHZ. 2021-08-31T17:30:00.36 0.3 undecidable manual P 227 88.3449 54 0.08 67
IV.ZEN8.EHZ. 2021-08-31T17:29:59.21 3.0 undecidable manual Pn -5.36 0
IV.PESA.HHZ. 2021-08-31T17:29:59.13 3.0 undecidable manual Pg -1.74 0
IV.LMD.HHZ. 2021-08-31T17:29:58.42 0.6 undecidable manual S 191 30.2475 138 -0.44 50
IV.MPPT.EHZ. 2021-08-31T17:29:58.41 0.3 undecidable manual P 232 69.7746 54 0.43 67
IV.VISG.HHZ. 2021-08-31T17:29:58.58 0.6 undecidable manual S 238 32.5452 136 -0.72 46
IV.IMOL.EHZ. 2021-08-31T17:29:57.25 0.3 undecidable manual S 298 3.5964 174 1.41 46
IV.RUFI.EHE. 2021-08-31T17:29:57.12 0.3 undecidable manual P 201 60.1953 117 0.39 67
IV.MOCL.EHZ. 2021-08-31T17:29:57.79 0.3 undecidable manual P 232 60.8946 117 0.97 54
IV.BRIS.HHZ. 2021-08-31T17:29:56.72 0.3 undecidable manual S 185 13.3755 159 0.26 72
IV.ASQU.HHE. 2021-08-31T17:29:56.66 0.1 undecidable manual P 179 60.7947 117 -0.14 96
IV.FNVD.HHZ. 2021-08-31T17:29:55.69 0.3 undecidable manual P 250 55.8996 119 -0.45 66
IV.SEI.HHZ. 2021-08-31T17:29:54.66 0.3 undecidable manual P 226 46.62 125 -0.26 71
IV.SFI.EHZ. 2021-08-31T17:29:54.84 0.1 undecidable manual P 174 49.0176 123 -0.4 92
IV.MTRZ.HNN. 2021-08-31T17:29:53.69 0.3 undecidable manual P 263 28.5492 139 0.84 63
IV.VISG.HHZ. 2021-08-31T17:29:52.56 0.1 undecidable manual P 238 32.5452 136 -0.71 85
IV.LMD.HHZ. 2021-08-31T17:29:52.39 0.1 undecidable manual P 191 30.2475 138 -0.62 90
IV.IMOL.EHZ. 2021-08-31T17:29:51.30 0.3 undecidable manual P 298 3.5964 174 0.03 79
IV.BRIS.HHZ. 2021-08-31T17:29:51.34 0.1 undecidable manual P 185 13.3755 159 -0.29 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:1.3 0.00007435 1.08 AML other m 2021-08-31T17:29:57.72
IV.BRIS.HHE. ML:1.4 0.00008840000000000001 0.3 AML other m 2021-08-31T17:29:57.57
IV.LMD.HHE. ML:1.5 0.00009140000000000001 0.36 AML other m 2021-08-31T17:29:58.51
IV.LMD.HHN. ML:1.6 0.00011394999999999999 0.3 AML other m 2021-08-31T17:29:58.89
IV.VISG.HHE. ML:1.2 0.000042300000000000005 1.12 AML other m 2021-08-31T17:29:58.86
IV.VISG.HHN. ML:1.2 0.0000462 1.62 AML other m 2021-08-31T17:29:58.09
IV.SFI.EHN. ML:1.6 0.00007985 0.52 AML other m 2021-08-31T17:30:03.51
IV.SFI.EHE. ML:1.4 0.000048049999999999996 1.22 AML other m 2021-08-31T17:30:03.96
IV.MPPT.EHE. ML:1.2 0.000021150000000000002 0.6 AML other m 2021-08-31T17:30:08.67
IV.MPPT.EHN. ML:1.0 0.000017250000000000003 0.46 AML other m 2021-08-31T17:30:10.60
IV.CRMI.HHN. ML:1.3 0.000021000000000000002 1.12 AML other m 2021-08-31T17:30:12.94
IV.CRMI.HHE. ML:1.3 0.00001965 0.96 AML other m 2021-08-31T17:30:12.38
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