Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 11-07-2021 and time 00:44:17 (UTC) in region 4 km SW Castel San Pietro Terme (BO)

A magnitude ML 1.8 earthquake occured in region: 4 km SW Castel San Pietro Terme (BO), on

  • 11-07-2021 00:44:17 (UTC)
  • 11-07-2021 02:44:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3740, 11.5630 at 24 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 San Pietro Terme BO 4 20811 20811
Dozza BO 6 6652 27463
Casalfiumanese BO 9 3438 30901
Ozzano dell'Emilia BO 10 13596 44497
Borgo Tossignano BO 11 3288 47785
Castel Guelfo di Bologna BO 11 4455 52240
Imola BO 12 69797 122037
Fontanelice BO 13 1943 123980
Medicina BO 13 16739 140719
Monterenzio BO 14 6035 146754
San Lazzaro di Savena BO 16 32065 178819
Riolo Terme RA 17 5720 184539
Castenaso BO 17 14925 199464
Casola Valsenio RA 17 2617 202081
Pianoro BO 18 17460 219541
Castel del Rio BO 18 1246 220787
Budrio BO 18 18412 239199
Castel Bolognese RA 20 9554 248753
Mordano BO 20 4760 253513

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km W of Imola (69797 inhabitants)
22 Km SE of Bologna (386663 inhabitants)
27 Km W of Faenza (58541 inhabitants)
42 Km W of Forlì (117913 inhabitants)
51 Km W of Ravenna (159116 inhabitants)
52 Km S of Ferrara (133155 inhabitants)
59 Km SE of Modena (184973 inhabitants)
60 Km W of Cesena (96758 inhabitants)
66 Km NE of Prato (191150 inhabitants)
70 Km SE of Carpi (70699 inhabitants)
71 Km NE of Pistoia (90315 inhabitants)
71 Km NE of Firenze (382808 inhabitants)
75 Km NE of Scandicci (50609 inhabitants)
80 Km S of Rovigo (51867 inhabitants)
82 Km E of Reggio nell'Emilia (171345 inhabitants)
87 Km W 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 1.8 2021-07-11
00:44:17		 44.3737 11.5633 24 2021-12-29
11:12:11		 Bollettino Sismico Italiano INGV 92779421
Reviewed
Rev100 		ML 1.8 2021-07-11
00:44:16		 44.3507 11.5312 28 2021-07-11
00:52:55		 Sala Sismica INGV-Roma 92593771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-11 00:44:17 ± 0.14
Latitude 44.3737 ± 0.0072
Longitude 11.5633 ± 0.0138
Depth (km) 24 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 92779421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1070
Semi-minor axis of confidence ellipse (meter) 501
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 262
Circular confidence region, given by single value of horizontal uncertainty (meter) 1070.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 41
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.90117
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 28
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 92779421
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-31 19:36:08

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 92593771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-11 00:52:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SGG.HHZ. 2021-07-11T00:46:09.64 3.0 undecidable manual Sg 13.94 0
IV.LAV9.HHZ. 2021-07-11T00:45:40.45 3.0 undecidable manual Sg 4.7 0
IX.SCL3.EHZ.02 2021-07-11T00:45:24.05 3.0 positive manual Pn -3.34 0
GU.RRL.HHZ. 2021-07-11T00:45:18.71 3.0 positive manual Pn 8.33 0
IV.ICAI.EHZ. 2021-07-11T00:45:17.61 3.0 positive manual Pn -0.89 0
IV.TEOL.HHE. 2021-07-11T00:44:49.02 0.3 undecidable manual S 4 109.9122 98 -0.35 58
ST.ZIAN.EHZ. 2021-07-11T00:44:48.84 0.6 undecidable manual P 360 211.0332 54 -0.17 27
IV.CTI.HHZ. 2021-07-11T00:44:45.05 0.6 undecidable manual P 2 185.8695 54 -0.83 26
SI.LUSI.HHZ. 2021-07-11T00:44:45.02 0.6 undecidable manual P 345 182.484 54 -0.43 30
IV.CRMI.HHZ. 2021-07-11T00:44:42.28 0.6 undecidable manual S 216 79.2651 101 1 32
IV.TREG.EHZ. 2021-07-11T00:44:39.59 0.3 undecidable manual P 346 131.3685 54 0.5 53
IV.ASQU.HHZ. 2021-07-11T00:44:38.84 0.6 undecidable manual S 164 66.4779 104 0.88 35
IV.PIEI.HHZ. 2021-07-11T00:44:38.50 0.6 undecidable manual P 140 121.0899 97 0.97 30
IV.SFI.EHZ. 2021-07-11T00:44:36.06 0.3 undecidable manual S 156 56.6988 107 0.62 60
GU.CARD.HHZ. 2021-07-11T00:44:35.08 0.3 undecidable manual P 246 94.239 99 1.64 33
IV.TEOL.HHE. 2021-07-11T00:44:35.42 0.1 undecidable manual P 4 109.9122 98 -0.41 77
IV.PII.HHZ. 2021-07-11T00:44:35.80 0.3 undecidable manual P 229 109.9122 98 -0.03 63
IV.BOSL.HHE. 2021-07-11T00:44:34.41 0.6 undecidable manual S 197 51.4152 109 0.33 44
IV.MOCL.EHZ. 2021-07-11T00:44:33.74 0.3 undecidable manual S 217 51.0156 109 -0.25 67
IV.BDI.HNZ. 2021-07-11T00:44:32.96 0.3 undecidable manual P 246 84.3489 101 1.03 47
GU.GSCL.HHN. 2021-07-11T00:44:32.26 0.6 undecidable manual P 268 77.367 102 1.38 27
IV.CRMI.HHZ. 2021-07-11T00:44:31.95 0.3 undecidable manual P 216 79.2651 101 0.79 53
IV.FNVD.HHZ. 2021-07-11T00:44:31.85 0.6 undecidable manual S 237 41.8248 113 0.16 46
GU.POPM.HHZ. 2021-07-11T00:44:30.66 0.6 undecidable manual P 241 73.7706 102 0.32 42
IV.SEI.HHZ. 2021-07-11T00:44:30.64 0.3 undecidable manual S 205 39.0276 115 -0.37 67
IV.LMD.HHZ. 2021-07-11T00:44:29.77 0.3 undecidable manual S 161 34.743 118 -0.24 69
IV.ASQU.HHZ. 2021-07-11T00:44:29.04 0.3 undecidable manual P 164 66.4779 104 -0.2 66
IV.FERS.EHZ. 2021-07-11T00:44:28.10 0.6 undecidable manual P 358 58.7967 106 0 46
IV.MPPT.EHN. 2021-07-11T00:44:27.94 0.3 undecidable manual P 219 59.5959 106 -0.27 66
IV.SFI.EHZ. 2021-07-11T00:44:27.58 0.3 undecidable manual P 156 56.6988 107 -0.2 67
IV.BRIS.HHZ. 2021-07-11T00:44:27.89 0.3 undecidable manual S 136 23.0547 131 0.46 68
IV.RUFI.EHE. 2021-07-11T00:44:27.76 0.6 undecidable manual P 184 59.5959 106 -0.45 42
IV.IMOL.EHZ. 2021-07-11T00:44:27.30 0.6 undecidable manual S 96 14.2746 146 1.43 30
IV.MOCL.EHZ. 2021-07-11T00:44:26.50 0.3 undecidable manual P 217 51.0156 109 -0.45 64
IV.ZCCA.HNN. 2021-07-11T00:44:26.86 0.3 undecidable manual P 267 46.62 111 0.55 62
IV.BOSL.HHE. 2021-07-11T00:44:26.49 0.3 undecidable manual P 197 51.4152 109 -0.51 63
IV.VISG.HHZ. 2021-07-11T00:44:26.82 0.3 undecidable manual S 207 22.8549 131 -0.58 64
IV.MTRZ.HHZ. 2021-07-11T00:44:25.93 0.6 undecidable manual S 239 12.876 149 0.26 48
IV.FNVD.HHZ. 2021-07-11T00:44:25.01 0.3 undecidable manual P 237 41.8248 113 -0.61 62
IV.SEI.HHZ. 2021-07-11T00:44:24.37 0.3 undecidable manual P 205 39.0276 115 -0.86 56
IV.FIU.EHZ. 2021-07-11T00:44:24.09 0.3 undecidable manual P 349 30.1476 123 0.06 72
IV.LMD.HHZ. 2021-07-11T00:44:23.92 0.3 undecidable manual P 161 34.743 118 -0.73 59
IV.MTRZ.HHZ. 2021-07-11T00:44:22.17 0.1 positive manual P 239 12.876 149 0.03 100
IV.BRIS.HHZ. 2021-07-11T00:44:22.92 0.1 positive manual P 136 23.0547 131 -0.24 94
IV.VISG.HHZ. 2021-07-11T00:44:22.35 0.3 undecidable manual P 207 22.8549 131 -0.79 59
IV.IMOL.EHZ. 2021-07-11T00:44:22.35 0.3 undecidable manual P 96 14.2746 146 0.09 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:1.5 0.00014549999999999999 0.92 AML other m 2021-07-11T00:44:27.10
IV.VISG.HHN. ML:1.7 0.00020400000000000003 0.38 AML other m 2021-07-11T00:44:27.54
IV.MTRZ.HHN. ML:1.9 0.00049 0.26 AML other m 2021-07-11T00:44:27.40
IV.MTRZ.HHE. ML:1.9 0.000517 1.72 AML other m 2021-07-11T00:44:28.04
IV.BRIS.HHE. ML:2.0 0.00039949999999999995 0.4 AML other m 2021-07-11T00:44:28.05
IV.BRIS.HHN. ML:1.6 0.0001905 0.22 AML other m 2021-07-11T00:44:28.10
IV.LMD.HHN. ML:1.7 0.000177 0.22 AML other m 2021-07-11T00:44:30.59
IV.LMD.HHE. ML:1.7 0.0001545 0.48 AML other m 2021-07-11T00:44:30.61
IV.SEI.HHN. ML:2.0 0.0003045 1.7 AML other m 2021-07-11T00:44:31.07
IV.SEI.HHE. ML:1.8 0.000178 1.24 AML other m 2021-07-11T00:44:32.64
IV.FIU.EHN. ML:1.8 0.00021349999999999999 1.24 AML other m 2021-07-11T00:44:33.72
IV.FIU.EHE. ML:1.8 0.0002265 0.36 AML other m 2021-07-11T00:44:36.53
IV.SFI.EHE. ML:1.4 0.00004815 0.42 AML other m 2021-07-11T00:44:36.48
IV.SFI.EHN. ML:1.4 0.00004615 0.68 AML other m 2021-07-11T00:44:36.77
IV.ASQU.HHN. ML:1.3 0.000037000000000000005 0.8 AML other m 2021-07-11T00:44:39.56
IV.FERS.EHE. ML:2.1 0.00023799999999999998 1.48 AML other m 2021-07-11T00:44:39.90
IV.FERS.EHN. ML:2.1 0.000241 1.32 AML other m 2021-07-11T00:44:42.91
IV.CRMI.HHE. ML:1.3 0.0000266 0.8 AML other m 2021-07-11T00:44:45.54
IV.ASQU.HHE. ML:1.3 0.00003235000000000001 0.54 AML other m 2021-07-11T00:44:46.63
IV.CRMI.HHN. ML:1.3 0.0000237 0.88 AML other m 2021-07-11T00:44:47.08
IV.PII.HHE. ML:1.8 0.0000575 0.58 AML other m 2021-07-11T00:44:53.34
IV.PII.HHN. ML:2.0 0.00007935 0.94 AML other m 2021-07-11T00:44:53.36
IV.TREG.EHE. ML:2.4 0.00017549999999999998 0.38 AML other m 2021-07-11T00:44:56.94
IV.TREG.EHN. ML:2.4 0.0001495 1.66 AML other m 2021-07-11T00:44:57.00
IV.PIEI.HHE. ML:1.3 0.00001465 0.94 AML other m 2021-07-11T00:44:58.69
IV.PIEI.HHN. ML:1.2 0.000012039999999999998 0.84 AML other m 2021-07-11T00:45:00.42
SI.LUSI.HHN. ML:2.2 0.00005505 0.22 AML other m 2021-07-11T00:45:11.59
IV.CTI.HHN. ML:2.1 0.0000395 0.24 AML other m 2021-07-11T00:45:13.45
IV.CTI.HHE. ML:2.0 0.0000359 1.58 AML other m 2021-07-11T00:45:14.95
SI.LUSI.HHE. ML:2.0 0.00003365 0.28 AML other m 2021-07-11T00:45:15.98
ST.ZIAN.EHE. ML:2.0 0.00002524 0.54 AML other m 2021-07-11T00:45:20.64
ST.ZIAN.EHN. ML:1.9 0.0000213 0.4 AML other m 2021-07-11T00:45:24.70
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