Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 02-08-2021 and time 20:39:09 (UTC) in region 6 km NW Palazzuolo sul Senio (FI)

A magnitude ML 1.1 earthquake occured in region: 6 km NW Palazzuolo sul Senio (FI), on

  • 02-08-2021 20:39:09 (UTC)
  • 02-08-2021 22:39:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1480, 11.4990 at 8 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.

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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
Palazzuolo sul Senio FI 6 1154 1154
Castel del Rio BO 7 1246 2400
Firenzuola FI 10 4726 7126
Marradi FI 12 3139 10265
Casola Valsenio RA 13 2617 12882
Fontanelice BO 13 1943 14825
Borgo Tossignano BO 16 3288 18113
Monghidoro BO 17 3749 21862
Casalfiumanese BO 19 3438 25300
Loiano BO 20 4294 29594

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Imola (69797 inhabitants)
34 Km W of Faenza (58541 inhabitants)
41 Km SE of Bologna (386663 inhabitants)
44 Km NE of Prato (191150 inhabitants)
44 Km W of Forlì (117913 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
50 Km NE of Scandicci (50609 inhabitants)
52 Km E of Pistoia (90315 inhabitants)
59 Km W of Cesena (96758 inhabitants)
63 Km W of Ravenna (159116 inhabitants)
72 Km SE of Modena (184973 inhabitants)
77 Km S of Ferrara (133155 inhabitants)
82 Km NW of Arezzo (99543 inhabitants)
86 Km SE of Carpi (70699 inhabitants)
86 Km W of Rimini (147750 inhabitants)
87 Km E of Lucca (89046 inhabitants)
92 Km SE of Reggio nell'Emilia (171345 inhabitants)
93 Km N of Siena (53903 inhabitants)
100 Km E of Pisa (89158 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
Reviewed
Rev100 		ML 1.1 2021-08-02
20:39:09		 44.1483 11.4987 8 2021-08-02
20:46:09		 Sala Sismica INGV-Roma 93577221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-02 20:39:09 ± 0.09
Latitude 44.1483 ± 0.0063
Longitude 11.4987 ± 0.0050
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93577221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 651
Semi-minor axis of confidence ellipse (meter) 333
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 351
Circular confidence region, given by single value of horizontal uncertainty (meter) 650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40919
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 16
Type of magnitude ML
Reference to an origin 93577221
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-02 20:46:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASQU.HHZ. 2021-08-02T20:39:24.40 0.3 undecidable manual S 149 45.4212 50 0 71
IV.SFI.EHZ. 2021-08-02T20:39:22.50 0.6 undecidable manual S 134 38.7279 50 -0.13 47
IV.MPPT.EHE. 2021-08-02T20:39:22.40 0.3 undecidable manual S 237 38.8278 50 -0.25 68
IV.CPGN.EHZ. 2021-08-02T20:39:22.72 3.0 undecidable manual P -0.11 0
IV.FNVD.HHE. 2021-08-02T20:39:19.80 0.6 undecidable manual S 274 29.9478 105 -0.1 48
IV.MOCL.EHZ. 2021-08-02T20:39:19.80 0.3 undecidable manual S 238 29.9478 105 -0.08 72
IV.MPPT.EHE. 2021-08-02T20:39:17.77 0.1 undecidable manual P 237 38.8278 50 0.83 75
IV.ASQU.HHZ. 2021-08-02T20:39:17.53 0.6 negative manual P 149 45.4212 50 -0.42 43
IV.BRIS.HHZ. 2021-08-02T20:39:17.80 0.3 undecidable manual S 68 22.9548 109 0.25 70
IV.SFI.EHZ. 2021-08-02T20:39:16.62 1.0 undecidable manual P 134 38.7279 50 -0.31 23
IV.LMD.HHZ. 2021-08-02T20:39:16.20 0.6 undecidable manual S 115 18.3705 113 0.12 49
IV.MOCL.EHZ. 2021-08-02T20:39:15.13 0.1 undecidable manual P 238 29.9478 105 -0.2 94
IV.SEI.HHZ. 2021-08-02T20:39:15.70 0.6 undecidable manual S 227 15.2736 117 0.59 43
IV.FNVD.HHE. 2021-08-02T20:39:15.07 0.1 undecidable manual P 274 29.9478 105 -0.28 92
IV.BOSL.HHZ. 2021-08-02T20:39:14.71 0.6 negative manual P 202 26.0517 107 0.12 48
IV.BRIS.HHZ. 2021-08-02T20:39:13.91 0.1 positive manual P 68 22.9548 109 -0.09 97
IV.MTRZ.HNE. 2021-08-02T20:39:13.58 0.1 undecidable manual P 342 19.1697 113 0.29 94
IV.LMD.HHZ. 2021-08-02T20:39:12.94 0.1 undecidable manual P 115 18.3705 113 -0.21 95
IV.VISG.HHZ. 2021-08-02T20:39:12.40 0.6 undecidable manual S 311 6.7932 139 -0.37 47
IV.SEI.HHZ. 2021-08-02T20:39:12.77 0.3 positive manual P 227 15.2736 117 0.19 72
IV.VISG.HHZ. 2021-08-02T20:39:11.16 0.1 positive manual P 311 6.7932 139 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHN. ML:0.0 0.00183 0.1 AML other m 2021-08-02T20:39:12.77
IV.VISG.HHE. ML:0.0 0.0006990000000000001 0.12 AML other m 2021-08-02T20:39:12.89
IV.SEI.HHN. ML:0.0 0.0012749999999999999 0.26 AML other m 2021-08-02T20:39:16.07
IV.LMD.HHN. ML:0.0 0.0000646 0.08 AML other m 2021-08-02T20:39:17.90
IV.LMD.HHE. ML:0.0 0.000059499999999999996 0.74 AML other m 2021-08-02T20:39:18.16
IV.SEI.HHE. ML:0.0 0.000382 0.28 AML other m 2021-08-02T20:39:18.34
IV.BRIS.HHE. ML:0.0 0.0001375 0.86 AML other m 2021-08-02T20:39:18.53
IV.BOSL.HHN. ML:0.0 0.00002775 0.78 AML other m 2021-08-02T20:39:19.12
IV.MOCL.EHN. ML:0.0 0.0000701 0.4 AML other m 2021-08-02T20:39:21.16
IV.MOCL.EHE. ML:0.0 0.00007489999999999999 0.96 AML other m 2021-08-02T20:39:22.53
IV.BOSL.HHE. ML:0.0 0.0000286 1.24 AML other m 2021-08-02T20:39:22.92
IV.BRIS.HHN. ML:0.0 0.000124 0.54 AML other m 2021-08-02T20:39:23.68
IV.SFI.EHE. ML:0.8 0.000022880579999999998 0.2816 AML other m 2021-08-02T20:39:22.93
IV.SFI.EHN. ML:0.8 0.000023373194999999998 0.2176 AML other m 2021-08-02T20:39:22.98
IV.ASQU.HHE. ML:0.7 0.000015101028000000002 0.2176 AML other m 2021-08-02T20:39:25.08
IV.ASQU.HHN. ML:0.8 0.000020780639999999998 0.2176 AML other m 2021-08-02T20:39:25.00
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