Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 04-07-2020 and time 05:37:24 (UTC) in region 3 km NW Riolo Terme (RA)

A magnitude ML 1.5 earthquake occured in region: 3 km NW Riolo Terme (RA), on

  • 04-07-2020 05:37:24 (UTC)
  • 04-07-2020 07:37:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2980, 11.7000 at 23 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 3 5720 5720
Imola BO 6 69797 75517
Casalfiumanese BO 7 3438 78955
Castel Bolognese RA 8 9554 88509
Dozza BO 9 6652 95161
Borgo Tossignano BO 9 3288 98449
Brisighella RA 10 7639 106088
Casola Valsenio RA 10 2617 108705
Fontanelice BO 12 1943 110648
Solarolo RA 14 4488 115136
Castel San Pietro Terme BO 14 20811 135947
Mordano BO 14 4760 140707
Bagnara di Romagna RA 14 2429 143136
Faenza RA 15 58541 201677
Castel Guelfo di Bologna BO 15 4455 206132
Modigliana FC 17 4560 210692
Castel del Rio BO 18 1246 211938
Massa Lombarda RA 20 10653 222591

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km S of Imola (69797 inhabitants)
15 Km W of Faenza (58541 inhabitants)
29 Km W of Forlì (117913 inhabitants)
36 Km SE of Bologna (386663 inhabitants)
42 Km W of Ravenna (159116 inhabitants)
47 Km W of Cesena (96758 inhabitants)
60 Km S of Ferrara (133155 inhabitants)
67 Km NE of Prato (191150 inhabitants)
69 Km NE of Firenze (382808 inhabitants)
73 Km SE of Modena (184973 inhabitants)
73 Km NE of Scandicci (50609 inhabitants)
74 Km W of Rimini (147750 inhabitants)
74 Km NE of Pistoia (90315 inhabitants)
84 Km SE of Carpi (70699 inhabitants)
86 Km S of Rovigo (51867 inhabitants)
94 Km N of Arezzo (99543 inhabitants)
96 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 1.5 2020-07-04
05:37:24		 44.2977 11.6995 23 2020-11-19
12:37:03		 Bollettino Sismico Italiano INGV 83558561
Reviewed
Rev100 		ML 1.5 2020-07-04
05:37:24		 44.3003 11.6903 22 2020-07-04
05:43:46		 Sala Sismica INGV-Roma 80761391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-04 05:37:24 ± 0.45
Latitude 44.2977 ± 0.0135
Longitude 11.6995 ± 0.0176
Depth (km) 23 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83558561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1403
Semi-minor axis of confidence ellipse (meter) 717
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 244
Circular confidence region, given by single value of horizontal uncertainty (meter) 1400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.06925
Epicentral distance of station farthest from the epicenter (degree) 0.40649
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 83558561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-06 15:46:07

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 80761391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-04 05:43:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SFI.EHZ. 2020-07-04T05:37:40.66 0.6 undecidable manual S 165 45.1215 109 1.16 33
IV.SEI.HHE. 2020-07-04T05:37:38.03 0.6 undecidable manual S 225 38.2284 113 0.24 46
IV.VISG.HHZ. 2020-07-04T05:37:34.62 0.3 undecidable manual S 240 24.2535 127 0.08 73
IV.LMD.HHZ. 2020-07-04T05:37:34.27 0.3 undecidable manual S 179 24.4533 127 -0.31 68
IV.MTRZ.HHZ. 2020-07-04T05:37:34.39 0.6 undecidable manual S 275 21.867 130 0.35 46
IV.SFI.EHZ. 2020-07-04T05:37:33.67 0.3 undecidable manual P 165 45.1215 109 0.53 64
IV.SEI.HHE. 2020-07-04T05:37:32.64 0.6 undecidable manual P 225 38.2284 113 0.49 43
IV.IMOL.EHZ. 2020-07-04T05:37:32.23 0.3 undecidable manual S 26 7.6812 159 0.43 70
IV.BRIS.HHZ. 2020-07-04T05:37:31.85 0.3 undecidable manual S 147 9.6792 154 -0.17 72
IV.LMD.HHZ. 2020-07-04T05:37:29.91 0.1 undecidable manual P 179 24.4533 127 -0.39 90
IV.MTRZ.HHZ. 2020-07-04T05:37:29.97 0.1 undecidable manual P 275 21.867 130 -0.02 99
IV.VISG.HHZ. 2020-07-04T05:37:29.40 0.1 positive manual P 240 24.2535 127 -0.88 76
IV.IMOL.EHZ. 2020-07-04T05:37:28.64 0.1 negative manual P 26 7.6812 159 -0.05 100
IV.BRIS.HHZ. 2020-07-04T05:37:28.68 0.1 negative manual P 147 9.6792 154 -0.14 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:1.4 0.0001800678 0.24 AML other m 2020-07-04T05:37:32.31
IV.BRIS.HHE. ML:1.3 0.000139569355 0.1984 AML other m 2020-07-04T05:37:32.39
IV.IMOL.HNN. ML:1.8 0.0004600567 0.1824 AML other m 2020-07-04T05:37:32.79
IV.IMOL.HNE. ML:1.8 0.000439764655 0.2528 AML other m 2020-07-04T05:37:32.79
IV.BRIS.HNN. ML:1.4 0.00017606854999999998 0.832 AML other m 2020-07-04T05:37:34.18
IV.VISG.HHE. ML:1.5 0.00015369475 1.8816 AML other m 2020-07-04T05:37:34.01
IV.VISG.HHN. ML:1.6 0.00016919 0.1216 AML other m 2020-07-04T05:37:35.08
IV.BRIS.HNE. ML:1.2 0.00009515600000000001 0.5696 AML other m 2020-07-04T05:37:35.49
IV.LMD.HHN. ML:1.0 0.00004183121 0.16 AML other m 2020-07-04T05:37:36.26
IV.LMD.HHE. ML:1.1 0.00005345701 0.2816 AML other m 2020-07-04T05:37:36.32
IV.MTRZ.HHE. ML:1.6 0.00019433635 0.2624 AML other m 2020-07-04T05:37:36.59
IV.MTRZ.HNE. ML:1.7 0.00022795200000000002 0.2816 AML other m 2020-07-04T05:37:36.46
IV.MTRZ.HHN. ML:1.5 0.00014860914999999998 0.24 AML other m 2020-07-04T05:37:36.69
IV.MTRZ.HNN. ML:1.5 0.00014339247 0.24 AML other m 2020-07-04T05:37:36.81
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