Earthquake with magnitude of ML 1.0 on date 31-08-2021 and time 20:00:15 (UTC) in region 4 km NW Borgo Tossignano (BO)

A magnitude ML 1.0 earthquake occured in region: 4 km NW Borgo Tossignano (BO), on

  • 31-08-2021 20:00:15 (UTC)
  • 31-08-2021 22:00:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.304, 11.548 at 30 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Borgo Tossignano BO 4 3288 3288
Fontanelice BO 5 1943 5231
Casalfiumanese BO 6 3438 8669
Dozza BO 9 6652 15321
Castel del Rio BO 11 1246 16567
Casola Valsenio RA 11 2617 19184
Castel San Pietro Terme BO 11 20811 39995
Monterenzio BO 12 6035 46030
Imola BO 14 69797 115827
Riolo Terme RA 14 5720 121547
Ozzano dell'Emilia BO 17 13596 135143
Castel Guelfo di Bologna BO 18 4455 139598
Loiano BO 18 4294 143892
Pianoro BO 19 17460 161352
Brisighella RA 20 7639 168991

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km W of Imola (69797 inhabitants)
27 Km SE of Bologna (386663 inhabitants)
27 Km W of Faenza (58541 inhabitants)
40 Km W of Forlì (117913 inhabitants)
53 Km W of Ravenna (159116 inhabitants)
58 Km W of Cesena (96758 inhabitants)
59 Km NE of Prato (191150 inhabitants)
60 Km S of Ferrara (133155 inhabitants)
62 Km SE of Modena (184973 inhabitants)
64 Km NE of Firenze (382808 inhabitants)
65 Km NE of Pistoia (90315 inhabitants)
67 Km NE of Scandicci (50609 inhabitants)
75 Km SE of Carpi (70699 inhabitants)
85 Km SE of Reggio nell'Emilia (171345 inhabitants)
86 Km W of Rimini (147750 inhabitants)
88 Km S of Rovigo (51867 inhabitants)
97 Km N of Arezzo (99543 inhabitants)
98 Km NE of Lucca (89046 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.0 2021-08-31
20:00:15
44.3038 11.548 30 2021-08-31
20:06:52
Sala Sismica INGV-Roma 94887241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 20:00:15 ± 0.61
Latitude 44.3038 ± 0.0324
Longitude 11.5480 ± 0.0314
Depth (km) 30 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94887241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3651
Semi-minor axis of confidence ellipse (meter) 1903
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 348
Circular confidence region, given by single value of horizontal uncertainty (meter) 3650
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 293
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.33365
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 94887241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 20:06:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IX.SCL3.EHZ.02 2021-08-31T20:01:43.84 3.0 undecidable manual Pg 21.700001 0
IV.SRES.HHZ. 2021-08-31T20:01:36.95 3.0 undecidable manual Sg 3.03 0
IV.CRAC.EHZ. 2021-08-31T20:01:34.49 3.0 positive manual Pn 3.48 0
IV.IMTC.HHZ. 2021-08-31T20:01:32.30 3.0 negative manual Pg 18.110001 0
IV.VITU.HHZ. 2021-08-31T20:01:15.85 3.0 negative manual Pn 4.1 0
IV.SACR.HHZ. 2021-08-31T20:01:11.27 3.0 undecidable manual Pn 1.7 0
IV.BULT.EHZ. 2021-08-31T20:01:07.57 3.0 undecidable manual Pn -6.1 0
IV.APEC.HHZ. 2021-08-31T20:01:03.28 3.0 undecidable manual Sg 0.26 0
IV.ROM9.HNZ. 2021-08-31T20:00:56.83 3.0 negative manual Pn 1.52 0
GU.BURY.HNZ. 2021-08-31T20:00:43.19 3.0 undecidable manual Pn 1.91 0
IV.LMD.HHZ. 2021-08-31T20:00:29.04 3.0 undecidable manual S 0
IV.FNVD.HHN. 2021-08-31T20:00:28.91 0.6 undecidable manual S 246 0.3336 124 -0.26 49
IV.SEI.HHZ. 2021-08-31T20:00:28.48 0.3 undecidable manual S 209 0.2842 129 0.49 70
IV.VISG.HHZ. 2021-08-31T20:00:24.67 0.3 undecidable manual S 215 0.1403 150 -0.53 72
IV.MTRZ.HHZ. 2021-08-31T20:00:24.91 0.6 undecidable manual S 276 0.0881 160 0.35 50
IV.FNVD.HHN. 2021-08-31T20:00:23.40 0.1 undecidable manual P 246 0.3336 124 0.14 100
IV.LMD.HHZ. 2021-08-31T20:00:23.07 3.0 undecidable manual P 0
IV.SEI.HHZ. 2021-08-31T20:00:22.75 0.6 positive manual P 209 0.2842 129 0.17 50
IV.BRIS.HHZ. 2021-08-31T20:00:22.55 3.0 negative manual P 0.89 0
IV.MTRZ.HHZ. 2021-08-31T20:00:20.51 0.3 positive manual P 276 0.0881 160 -0.08 79
IV.VISG.HHZ. 2021-08-31T20:00:20.73 0.3 undecidable manual P 215 0.1403 150 -0.24 76
IV.TREG.EHZ. 2021-08-31T20:00:17.92 3.0 undecidable manual P 15.02 0
IV.ZCCA.HNZ. 2021-08-31T20:00:15.84 3.0 undecidable manual P -2.73 0
GU.GSCL.HHZ. 2021-08-31T20:00:12.32 3.0 undecidable manual P -6.52 0
IV.BOZZ.EHZ. 2021-08-31T20:00:09.44 3.0 positive manual P 0.39 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:0.8 3.225E-5 0.54 AML other m 2021-08-31T20:00:24.99
IV.VISG.HHN. ML:1 4.785E-5 1.36 AML other m 2021-08-31T20:00:24.83
IV.MTRZ.HHE. ML:1.5 0.0001555 0.32 AML other m 2021-08-31T20:00:25.58
IV.MTRZ.HHN. ML:1.5 0.00016 0.74 AML other m 2021-08-31T20:00:25.69
IV.LMD.HHE. ML:0.6 1.525E-5 0.28 AML other m 2021-08-31T20:00:30.39
IV.LMD.HHN. ML:0.6 1.62E-5 1 AML other m 2021-08-31T20:00:30.16
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