Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.9 on date 01-04-2021 and time 10:49:06 (Italy) in region 4 km SE Firenzuola (FI)

A magnitude ML 0.9 (quarry blast) earthquake occured in region: 4 km SE Firenzuola (FI), on

  • 01-04-2021 08:49:06 (UTC)
  • 01-04-2021 10:49:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1000, 11.4170 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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
Firenzuola FI 4 4726 4726
Palazzuolo sul Senio FI 11 1154 5880
Castel del Rio BO 15 1246 7126
Monghidoro BO 16 3749 10875
Marradi FI 16 3139 14014
Borgo San Lorenzo FI 16 18211 32225
Scarperia e San Piero FI 17 12217 44442
Barberino di Mugello FI 18 10836 55278
Vicchio FI 19 8044 63322
San Benedetto Val di Sambro BO 20 4315 67637

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km NE of Prato (191150 inhabitants)
37 Km SW of Imola (69797 inhabitants)
39 Km NE of Firenze (382808 inhabitants)
42 Km NE of Scandicci (50609 inhabitants)
43 Km W of Faenza (58541 inhabitants)
44 Km E of Pistoia (90315 inhabitants)
44 Km S of Bologna (386663 inhabitants)
52 Km W of Forlì (117913 inhabitants)
66 Km W of Cesena (96758 inhabitants)
72 Km W of Ravenna (159116 inhabitants)
72 Km SE of Modena (184973 inhabitants)
79 Km E of Lucca (89046 inhabitants)
80 Km NW of Arezzo (99543 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
87 Km SE of Carpi (70699 inhabitants)
87 Km N of Siena (53903 inhabitants)
91 Km SE of Reggio nell'Emilia (171345 inhabitants)
92 Km E of Pisa (89158 inhabitants)
92 Km W of Rimini (147750 inhabitants)
97 Km E of Viareggio (62467 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 0.9 2021-04-01
08:49:06		 44.1002 11.4167 1 2021-07-12
16:55:15		 Bollettino Sismico Italiano INGV 91261661
Reviewed
Rev100 		ML 1.0 2021-04-01
08:49:06		 44.1097 11.415 7 2021-04-01
08:58:47		 Sala Sismica INGV-Roma 88671031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-01 08:49:06 ± 0.1
Latitude 44.1002 ± 0.0063
Longitude 11.4167 ± 0.0088
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 91261661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 740
Semi-minor axis of confidence ellipse (meter) 650
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 292
Circular confidence region, given by single value of horizontal uncertainty (meter) 740.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.27429
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 88671031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-01 08:58:47

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 91261661
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-14 09:34:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HVIT.HHZ. 2021-04-01T08:50:47.33 3.0 positive manual Pn -6.13 0
IV.BSSO.HHZ. 2021-04-01T08:50:43.78 3.0 undecidable manual Sg 5.01 0
TV.SU26.HHZ. 2021-04-01T08:50:37.53 3.0 negative manual Pg 10.09 0
IV.SALB.HHZ. 2021-04-01T08:50:32.45 3.0 undecidable manual Pn 5.82 0
IV.PIPA.HHZ. 2021-04-01T08:50:31.64 3.0 undecidable manual Pn -2.31 0
IV.TDS.HHZ. 2021-04-01T08:50:29.66 3.0 undecidable manual Pn 0.71 0
IV.QLNO.HHZ. 2021-04-01T08:50:23.89 3.0 undecidable manual Sg 7.06 0
IV.MILN.HNZ. 2021-04-01T08:50:16.81 3.0 undecidable manual Sg 4.43 0
ST.CARE.EHZ. 2021-04-01T08:50:15.03 3.0 undecidable manual Sn -2.28 0
RF.GEPF.HHZ. 2021-04-01T08:50:15.96 3.0 undecidable manual Sn -0.65 0
IV.MTRA.EHZ. 2021-04-01T08:50:06.61 3.0 undecidable manual Sg 4.45 0
IV.MTMR.EHZ. 2021-04-01T08:50:04.05 3.0 undecidable manual Pn -2.66 0
IV.VOBA.EHZ. 2021-04-01T08:50:00.90 3.0 undecidable manual Sg -0.01 0
IV.ZEN8.EHZ. 2021-04-01T08:49:54.05 3.0 undecidable manual Sn -5.01 0
GU.CANO.HHZ. 2021-04-01T08:49:50.07 3.0 negative manual Pg 4.1 0
IV.MCIV.CHZ. 2021-04-01T08:49:46.00 3.0 undecidable manual S -3.72 0
IV.VOBA.EHZ. 2021-04-01T08:49:39.43 3.0 positive manual Pg 3.39 0
IV.ZEN8.EHZ. 2021-04-01T08:49:37.88 3.0 undecidable manual Pg 2.88 0
IV.MAGO.CHZ. 2021-04-01T08:49:33.72 3.0 undecidable manual Sn -9.99 0
IV.ARVD.HHZ. 2021-04-01T08:49:27.94 3.0 undecidable manual P 1.59 0
IV.MNTV.EHZ. 2021-04-01T08:49:25.22 3.0 positive manual Pg -3.58 0
IT.UMBT.HGZ. 2021-04-01T08:49:22.07 3.0 positive manual Pg -1.24 0
IV.PARC.HHZ. 2021-04-01T08:49:13.77 3.0 negative manual P -3.51 0
IV.MPPT.EHE. 2021-04-01T08:49:12.45 0.1 undecidable manual P 239 30.4473 91 -0.2 95
IV.RINC.HHZ. 2021-04-01T08:49:12.02 0.1 undecidable manual P 147 28.1496 91 -0.17 96
IV.MTRZ.HHE. 2021-04-01T08:49:11.80 0.3 undecidable manual P 2 23.5542 91 0.52 67
IV.LMD.HHE. 2021-04-01T08:49:11.07 0.3 undecidable manual P 96 23.2545 91 -0.15 73
IV.FNVD.HHE. 2021-04-01T08:49:11.27 0.3 undecidable manual P 288 24.5532 91 -0.2 72
IV.MOCL.EHE. 2021-04-01T08:49:10.89 0.1 undecidable manual P 241 21.5673 91 0.02 100
IV.RONT.HHZ. 2021-04-01T08:49:09.20 0.1 undecidable manual P 174 11.877 92 0.26 97
IV.SEI.HHZ. 2021-04-01T08:49:08.09 0.1 positive manual P 222 6.8931 94 0.16 100
IV.VISG.HHZ. 2021-04-01T08:49:08.37 0.1 undecidable manual P 8 9.9789 93 -0.18 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:1.0 0.00017549999999999998 0.16 AML other m 2021-04-01T08:49:10.52
IV.VISG.HHN. ML:0.9 0.0001365 0.4 AML other m 2021-04-01T08:49:11.47
IV.SEI.HHE. ML:1.3 0.00033650000000000005 0.32 AML other m 2021-04-01T08:49:12.25
IV.RONT.HHN. ML:1.0 0.0001735 0.18 AML other m 2021-04-01T08:49:13.97
IV.RONT.HHE. ML:1.0 0.000145 0.16 AML other m 2021-04-01T08:49:14.54
IV.SEI.HHN. ML:1.3 0.00035749999999999996 0.48 AML other m 2021-04-01T08:49:15.18
IV.RINC.HHE. ML:0.9 0.000043299999999999995 0.22 AML other m 2021-04-01T08:49:17.53
IV.RINC.HHN. ML:0.6 0.000025450000000000002 1.3 AML other m 2021-04-01T08:49:18.00
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