Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.3 on date 21-08-2021 and time 12:04:39 (UTC) in region 1 km W Pieve Santo Stefano (AR)

A magnitude ML 0.3 earthquake occured in region: 1 km W Pieve Santo Stefano (AR), on

  • 21-08-2021 12:04:39 (UTC)
  • 21-08-2021 14:04:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6730, 12.0260 at 10 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
Pieve Santo Stefano AR 1 3183 3183
Caprese Michelangelo AR 4 1426 4609
Chiusi della Verna AR 8 2023 6632
Chitignano AR 12 899 7531
Badia Tedalda AR 14 1087 8618
Verghereto FC 14 1907 10525
Sansepolcro AR 15 15884 26409
Anghiari AR 15 5638 32047
Castel Focognano AR 15 3149 35196
Subbiano AR 16 6331 41527
Bibbiena AR 17 12241 53768
Casteldelci RN 17 407 54175
Capolona AR 18 5438 59613
San Giustino PG 18 11297 70910

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NE of Arezzo (99543 inhabitants)
55 Km SW of Cesena (96758 inhabitants)
61 Km SW of Rimini (147750 inhabitants)
61 Km S of Forlì (117913 inhabitants)
63 Km E of Firenze (382808 inhabitants)
68 Km NE of Siena (53903 inhabitants)
69 Km E of Scandicci (50609 inhabitants)
69 Km S of Faenza (58541 inhabitants)
69 Km NW of Perugia (166134 inhabitants)
76 Km W of Pesaro (94582 inhabitants)
78 Km E of Prato (191150 inhabitants)
80 Km SE of Imola (69797 inhabitants)
82 Km W of Fano (60888 inhabitants)
84 Km S of Ravenna (159116 inhabitants)
94 Km E of Pistoia (90315 inhabitants)
97 Km NW of Foligno (57155 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 0.3 2021-08-21
12:04:39		 43.6728 12.0262 10 2021-08-21
12:50:57		 Sala Sismica INGV-Roma 94460361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-21 12:04:39 ± 0.11
Latitude 43.6728 ± 0.0081
Longitude 12.0262 ± 0.0062
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94460361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 913
Semi-minor axis of confidence ellipse (meter) 439
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 344
Circular confidence region, given by single value of horizontal uncertainty (meter) 910.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 153
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40559
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 94460361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-21 12:50:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EFIU.HHZ. 2021-08-21T12:06:30.77 3.0 undecidable manual Pg 21.799999 0
IV.CDRU.HHZ. 2021-08-21T12:06:25.46 3.0 undecidable manual Sn 0.48 0
IV.PETRA.HHZ. 2021-08-21T12:06:20.08 3.0 undecidable manual Pg 15.54 0
IV.MCRV.HHZ. 2021-08-21T12:06:18.85 3.0 undecidable manual Sn 1.08 0
IV.HVIT.HHZ. 2021-08-21T12:06:14.99 3.0 undecidable manual Pn -1.85 0
IV.ESCV.HHZ. 2021-08-21T12:06:09.70 3.0 negative manual Pn 1.72 0
IV.OVO.HHZ. 2021-08-21T12:06:09.48 3.0 undecidable manual Sn 0.87 0
ST.PANI.EHZ. 2021-08-21T12:05:44.42 3.0 undecidable manual Sg 5.88 0
IV.ZONE.HHZ. 2021-08-21T12:05:38.91 3.0 undecidable manual Sn -0.43 0
IV.AGLI.HHZ. 2021-08-21T12:05:28.76 3.0 undecidable manual Pn 3.88 0
IV.CADC.EHZ. 2021-08-21T12:05:07.88 3.0 positive manual Pn 0.09 0
IV.RIBO.EHZ.01 2021-08-21T12:05:07.11 3.0 undecidable manual Sn -0.33 0
GU.GSCL.HHZ. 2021-08-21T12:04:54.52 3.0 undecidable manual Pg 0.53 0
IV.NARO.HHZ. 2021-08-21T12:04:54.18 0.6 undecidable manual S 99 45.0216 50 0.1 47
IV.PIEI.HHZ. 2021-08-21T12:04:53.44 0.6 undecidable manual S 110 43.623 50 -0.26 46
IV.ATPC.HNE. 2021-08-21T12:04:53.18 0.3 undecidable manual S 121 40.626 50 0.27 68
IV.CAFI.HNE. 2021-08-21T12:04:52.00 0.6 undecidable manual S 187 38.4282 50 -0.31 46
IV.ATPC.HNE. 2021-08-21T12:04:47.52 0.6 undecidable manual P 121 40.626 50 0.38 44
IV.PIEI.HHZ. 2021-08-21T12:04:47.33 0.6 negative manual P 110 43.623 50 -0.26 46
IV.NARO.HHZ. 2021-08-21T12:04:47.56 0.6 undecidable manual P 99 45.0216 50 -0.25 46
IV.CAFI.HNE. 2021-08-21T12:04:46.74 0.3 undecidable manual P 187 38.4282 50 -0.05 72
IV.PARC.HHZ. 2021-08-21T12:04:45.85 0.6 undecidable manual S 99 17.2716 119 -0.22 48
IV.ATMC.EHE. 2021-08-21T12:04:45.51 0.6 undecidable manual P 152 28.4493 108 0.27 47
IV.ASQU.HHZ. 2021-08-21T12:04:44.25 0.6 undecidable manual P 306 23.4543 112 -0.05 50
IV.CRE.HHZ. 2021-08-21T12:04:43.57 0.6 undecidable manual S 225 8.4804 138 -0.07 50
IV.PARC.HHZ. 2021-08-21T12:04:43.23 0.1 undecidable manual P 99 17.2716 119 0.05 100
IV.CRE.HHZ. 2021-08-21T12:04:41.91 0.1 positive manual P 225 8.4804 138 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRE.HHN. ML:0.5 0.00005153236 0.2368 AML other m 2021-08-21T12:04:45.10
IV.CRE.HHE. ML:0.5 0.000042999999999999995 0.22 AML other m 2021-08-21T12:04:44.63
IV.PARC.HHN. ML:1.0 0.00009415 0.1 AML other m 2021-08-21T12:04:46.07
IV.PARC.HHE. ML:0.5 0.00002375 0.12 AML other m 2021-08-21T12:04:46.30
IV.ASQU.HHE. ML:-0.1 0.0000057298597 0.2432 AML other m 2021-08-21T12:04:49.99
IV.ASQU.HHN. ML:-0.1 0.000006006513 0.3392 AML other m 2021-08-21T12:04:48.77
IV.PIEI.HHE. ML:0.2 0.000006873509 0.0832 AML other m 2021-08-21T12:04:53.94
IV.PIEI.HHN. ML:0.2 0.0000055150695 0.0576 AML other m 2021-08-21T12:04:54.51
IV.NARO.HHE. ML:0.2 0.000005470285 0.0576 AML other m 2021-08-21T12:04:54.67
IV.NARO.HHN. ML:0.2 0.000007105171 0.0576 AML other m 2021-08-21T12:04:54.66
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