Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 14-08-2021 and time 07:46:55 (UTC) in region 4 km NW Riolo Terme (RA)

A magnitude ML 1.2 earthquake occured in region: 4 km NW Riolo Terme (RA), on

  • 14-08-2021 07:46:55 (UTC)
  • 14-08-2021 09:46:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3000, 11.6900 at 21 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
Riolo Terme RA 4 5720 5720
Casalfiumanese BO 6 3438 9158
Imola BO 6 69797 78955
Dozza BO 8 6652 85607
Borgo Tossignano BO 8 3288 88895
Castel Bolognese RA 9 9554 98449
Casola Valsenio RA 10 2617 101066
Brisighella RA 11 7639 108705
Fontanelice BO 11 1943 110648
Castel San Pietro Terme BO 14 20811 131459
Solarolo RA 14 4488 135947
Mordano BO 15 4760 140707
Bagnara di Romagna RA 15 2429 143136
Castel Guelfo di Bologna BO 15 4455 147591
Faenza RA 16 58541 206132
Castel del Rio BO 18 1246 207378
Modigliana FC 18 4560 211938
Massa Lombarda RA 20 10653 222591

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km SW of Imola (69797 inhabitants)
16 Km W of Faenza (58541 inhabitants)
29 Km W of Forlì (117913 inhabitants)
35 Km SE of Bologna (386663 inhabitants)
43 Km W of Ravenna (159116 inhabitants)
48 Km W of Cesena (96758 inhabitants)
60 Km S of Ferrara (133155 inhabitants)
66 Km NE of Prato (191150 inhabitants)
68 Km NE of Firenze (382808 inhabitants)
72 Km SE of Modena (184973 inhabitants)
73 Km NE of Scandicci (50609 inhabitants)
74 Km NE of Pistoia (90315 inhabitants)
75 Km W of Rimini (147750 inhabitants)
83 Km SE of Carpi (70699 inhabitants)
86 Km S of Rovigo (51867 inhabitants)
94 Km N of Arezzo (99543 inhabitants)
95 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 1.2 2021-08-14
07:46:55		 44.3002 11.6903 21 2021-12-29
11:12:31		 Bollettino Sismico Italiano INGV 95514311
Reviewed
Rev100 		ML 1.0 2021-08-14
07:46:56		 44.2328 11.6722 7 2021-08-14
07:53:38		 Sala Sismica INGV-Roma 94122061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-14 07:46:55 ± 0.29
Latitude 44.3002 ± 0.0117
Longitude 11.6903 ± 0.0201
Depth (km) 21 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95514311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1439
Semi-minor axis of confidence ellipse (meter) 1034
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 62
Circular confidence region, given by single value of horizontal uncertainty (meter) 1440.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 140
Number of associated phases, regardless of their use for origin computation 42
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.50812
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 94122061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-14 07:53:38

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 95514311
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-16 16:59:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EFIU.HHZ. 2021-08-14T07:48:24.97 3.0 negative manual Pg 11.08 0
MN.BNI.HHZ. 2021-08-14T07:48:10.63 3.0 negative manual Pg 21.049999 0
IV.PLLN.EHZ. 2021-08-14T07:48:10.55 3.0 undecidable manual Pn 2.41 0
OX.CIMO.HHZ. 2021-08-14T07:48:08.90 3.0 undecidable manual Sg 11.64 0
IV.SCHR.EHZ. 2021-08-14T07:48:05.45 3.0 positive manual Pg 16.9 0
IV.PTRJ.HNZ. 2021-08-14T07:47:56.30 3.0 undecidable manual Sn -1.96 0
IV.AGLI.HHZ. 2021-08-14T07:47:46.77 3.0 undecidable manual Pg 9.51 0
IV.ZEN8.EHZ. 2021-08-14T07:47:44.77 3.0 undecidable manual Sn -5.02 0
IV.VARE.HHZ. 2021-08-14T07:47:39.76 3.0 undecidable manual Pn 3.13 0
IV.VOBA.EHZ. 2021-08-14T07:47:36.26 3.0 positive manual Pg 13.5 0
IV.BSSO.HHZ. 2021-08-14T07:47:30.30 3.0 undecidable manual Pg 5.78 0
RF.GEPF.HHZ. 2021-08-14T07:47:28.82 3.0 positive manual Pn 3.17 0
IV.LRP.EHZ. 2021-08-14T07:47:24.82 3.0 positive manual Pg 6.52 0
IV.RNI2.HHZ. 2021-08-14T07:47:22.98 3.0 undecidable manual Pg 2.77 0
IV.ZEN8.EHZ. 2021-08-14T07:47:22.27 3.0 undecidable manual Pn 0.82 0
IV.CTI.HHZ. 2021-08-14T07:47:22.80 3.0 undecidable manual Pn -0.27 0
IV.CADC.HNZ. 2021-08-14T07:47:18.67 3.0 undecidable manual Pn -4.45 0
IV.ASQU.HHZ. 2021-08-14T07:47:13.72 0.3 undecidable manual S 172 56.3991 102 0.51 64
IV.BOSL.HHZ. 2021-08-14T07:47:11.31 0.6 undecidable manual S 212 48.1185 105 0.27 47
IV.TEOL.HHZ. 2021-08-14T07:47:11.32 3.0 undecidable manual Pn -2.67 0
IV.SFI.EHZ. 2021-08-14T07:47:11.01 0.6 undecidable manual S 164 45.621 106 0.6 42
IV.FNVD.HHE. 2021-08-14T07:47:11.86 0.6 undecidable manual S 252 47.4192 105 0.98 37
IV.TOLF.HHZ. 2021-08-14T07:47:09.20 3.0 undecidable manual Pg -1.89 0
IV.SEI.HHE. 2021-08-14T07:47:08.35 0.6 undecidable manual S 224 37.9287 110 -0.12 49
IV.CASP.HHZ. 2021-08-14T07:47:08.91 3.0 positive manual Pn -0.19 0
IV.LMD.HHZ. 2021-08-14T07:47:05.30 0.6 undecidable manual S 177 24.753 122 0.02 51
IV.ASQU.HHZ. 2021-08-14T07:47:05.68 0.3 undecidable manual P 172 56.3991 102 -0.01 73
IV.MOCL.EHE. 2021-08-14T07:47:05.30 0.3 undecidable manual P 231 52.1034 103 0.25 70
IV.VISG.HHZ. 2021-08-14T07:47:04.35 0.6 undecidable manual S 239 23.754 123 -0.72 42
IV.BOSL.HHZ. 2021-08-14T07:47:04.46 0.3 undecidable manual P 212 48.1185 105 0.02 74
IV.FNVD.HHE. 2021-08-14T07:47:04.60 0.1 undecidable manual P 252 47.4192 105 0.25 95
IV.IMOL.EHZ. 2021-08-14T07:47:03.05 0.6 undecidable manual S 32 7.7811 156 0.82 43
IV.SFI.EHZ. 2021-08-14T07:47:03.89 0.3 undecidable manual P 164 45.621 106 -0.18 72
IV.BRIS.HHZ. 2021-08-14T07:47:02.29 0.6 undecidable manual S 144 10.3785 149 -0.26 50
IV.SEI.HHE. 2021-08-14T07:47:02.77 0.3 undecidable manual P 224 37.9287 110 -0.18 73
IV.VISG.HHZ. 2021-08-14T07:47:00.42 0.1 undecidable manual P 239 23.754 123 -0.57 90
IV.LMD.HHZ. 2021-08-14T07:47:00.57 0.1 undecidable manual P 177 24.753 122 -0.54 92
IV.CRTC.HHZ. 2021-08-14T07:46:59.64 3.0 undecidable manual S 0.39 0
IV.BRIS.HHZ. 2021-08-14T07:46:59.27 0.1 undecidable manual P 144 10.3785 149 -0.27 100
IV.IMOL.EHZ. 2021-08-14T07:46:59.47 0.3 undecidable manual P 32 7.7811 156 0.12 79
IV.MNTT.EHZ. 2021-08-14T07:46:57.01 3.0 negative manual Pn -5.33 0
IV.NARO.HHZ. 2021-08-14T07:46:54.28 3.0 undecidable manual S -0.58 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:1.4 0.0001895 0.38 AML other m 2021-08-14T07:47:02.59
IV.BRIS.HHE. ML:1.5 0.00023249999999999999 0.56 AML other m 2021-08-14T07:47:02.72
IV.IMOL.HNN. ML:2.0 0.0007295 0.86 AML other m 2021-08-14T07:47:04.60
IV.VISG.HHE. ML:1.0 0.00005355 1.26 AML other m 2021-08-14T07:47:05.67
IV.LMD.HHN. ML:1.3 0.00009675000000000001 1.84 AML other m 2021-08-14T07:47:06.95
IV.VISG.HHN. ML:1.0 0.00005115 0.12 AML other m 2021-08-14T07:47:06.19
IV.LMD.HHE. ML:1.1 0.00006110000000000001 0.22 AML other m 2021-08-14T07:47:07.33
IV.SFI.EHN. ML:1.0 0.000028450000000000004 0.42 AML other m 2021-08-14T07:47:12.65
IV.SFI.EHE. ML:1.0 0.000027700000000000002 0.64 AML other m 2021-08-14T07:47:13.51
IV.ASQU.HHE. ML:1.0 0.000021150000000000002 0.9 AML other m 2021-08-14T07:47:15.59
IV.ASQU.HHN. ML:0.9 0.000017100000000000002 1.42 AML other m 2021-08-14T07:47:16.22
IV.IMOL.HNE. ML:2.2 0.00126 0.06 AML other m 2021-08-14T07:47:23.97
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