Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 26-10-2021 and time 03:14:08 (UTC) in region 5 km SE Pieve Santo Stefano (AR)

A magnitude ML 1.1 earthquake occured in region: 5 km SE Pieve Santo Stefano (AR), on

  • 26-10-2021 03:14:08 (UTC)
  • 26-10-2021 05:14:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6240, 12.0680 at 9 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 6 3183 3183
Caprese Michelangelo AR 7 1426 4609
Sansepolcro AR 8 15884 20493
Anghiari AR 9 5638 26131
San Giustino PG 12 11297 37428
Badia Tedalda AR 13 1087 38515
Chiusi della Verna AR 14 2023 40538
Citerna PG 14 3531 44069
Chitignano AR 16 899 44968
Monterchi AR 16 1757 46725
Subbiano AR 17 6331 53056
Capolona AR 18 5438 58494
Borgo Pace PU 19 606 59100
Castel Focognano AR 19 3149 62249
Verghereto FC 20 1907 64156

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NE of Arezzo (99543 inhabitants)
59 Km S of Cesena (96758 inhabitants)
63 Km NW of Perugia (166134 inhabitants)
63 Km SW of Rimini (147750 inhabitants)
67 Km S of Forlì (117913 inhabitants)
67 Km E of Firenze (382808 inhabitants)
68 Km NE of Siena (53903 inhabitants)
73 Km E of Scandicci (50609 inhabitants)
75 Km W of Pesaro (94582 inhabitants)
75 Km S of Faenza (58541 inhabitants)
80 Km W of Fano (60888 inhabitants)
83 Km E of Prato (191150 inhabitants)
86 Km SE of Imola (69797 inhabitants)
89 Km S of Ravenna (159116 inhabitants)
90 Km NW of Foligno (57155 inhabitants)
99 Km E of Pistoia (90315 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 2021-10-26
03:14:08		 43.6237 12.0677 9 2021-10-26
03:19:25		 Sala Sismica INGV-Roma 96992451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 03:14:08 ± 0.08
Latitude 43.6237 ± 0.0054
Longitude 12.0677 ± 0.0050
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96992451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 590
Semi-minor axis of confidence ellipse (meter) 299
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 359
Circular confidence region, given by single value of horizontal uncertainty (meter) 590.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.37142
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 22
Type of magnitude ML
Reference to an origin 96992451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 03:19:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.CARD.HHZ. 2021-10-26T03:14:31.84 3.0 undecidable manual P 0.22 0
IV.PII.HHZ. 2021-10-26T03:14:30.38 3.0 negative manual P 0.02 0
GU.MAIM.HHZ. 2021-10-26T03:14:30.41 3.0 undecidable manual P -0.69 0
IV.PE3.EHZ. 2021-10-26T03:14:21.18 0.1 undecidable manual S 77 35.3424 50 0.71 79
IV.PIEI.HHZ. 2021-10-26T03:14:21.12 0.1 undecidable manual S 104 38.8278 50 -0.27 90
IV.NARO.HHZ. 2021-10-26T03:14:21.95 0.1 undecidable manual S 92 41.2254 50 -0.09 93
IV.CAFI.HHZ. 2021-10-26T03:14:20.00 0.1 undecidable manual S 194 33.6441 50 -0.02 96
IV.APEC.HHZ. 2021-10-26T03:14:19.00 0.1 undecidable manual S 104 29.2485 107 0.22 93
IV.NARO.HHZ. 2021-10-26T03:14:15.82 1.0 negative manual P 92 41.2254 50 -0.35 22
IV.CAFI.HHZ. 2021-10-26T03:14:15.05 0.6 negative manual P 194 33.6441 50 0.04 48
IV.BADI.EHZ. 2021-10-26T03:14:15.38 0.1 undecidable manual S 132 19.0698 116 -0.1 96
IV.PE3.EHZ. 2021-10-26T03:14:15.30 1.0 positive manual P 77 35.3424 50 0.04 24
IV.SFI.EHZ. 2021-10-26T03:14:15.03 1.0 positive manual P 331 35.8419 50 -0.31 22
IV.PIEI.HHZ. 2021-10-26T03:14:15.49 0.6 negative manual P 104 38.8278 50 -0.31 45
IV.CPGN.EHZ. 2021-10-26T03:14:14.56 1.0 undecidable manual P 46 28.2495 108 0.45 22
IV.ASQU.HHZ. 2021-10-26T03:14:14.07 0.6 negative manual P 311 29.4483 107 -0.26 46
IV.APEC.HHZ. 2021-10-26T03:14:14.19 0.6 undecidable manual P 104 29.2485 107 -0.1 47
IV.PARC.HHZ. 2021-10-26T03:14:13.61 0.1 undecidable manual S 79 13.9749 123 -0.35 92
IV.CRE.HHZ. 2021-10-26T03:14:12.70 0.1 undecidable manual S 267 9.2796 135 0.01 100
IV.SSP9.EHZ. 2021-10-26T03:14:12.46 0.1 undecidable manual S 137 7.4814 141 0.19 97
IV.BADI.EHZ. 2021-10-26T03:14:12.37 0.1 undecidable manual P 132 19.0698 116 -0.02 98
IV.PARC.HHZ. 2021-10-26T03:14:11.44 0.1 undecidable manual P 79 13.9749 123 -0.07 98
IV.SSP9.EHZ. 2021-10-26T03:14:10.60 0.1 undecidable manual P 137 7.4814 141 0.07 99
IV.CRE.HHZ. 2021-10-26T03:14:10.95 0.1 positive manual P 267 9.2796 135 0.17 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSP9.EHE. ML:0.7 0.00008165 0.26 AML other m 2021-10-26T03:14:10.89
IV.SSP9.EHN. ML:0.8 0.00009065000000000001 0.5 AML other m 2021-10-26T03:14:12.57
IV.CRE.HHN. ML:1.4 0.0003705 0.18 AML other m 2021-10-26T03:14:12.89
IV.CRE.HHE. ML:1.2 0.00020899999999999998 1.8 AML other m 2021-10-26T03:14:13.05
IV.PARC.HHE. ML:1.1 0.00013800000000000002 0.08 AML other m 2021-10-26T03:14:13.75
IV.PARC.HHN. ML:1.6 0.0004275 0.1 AML other m 2021-10-26T03:14:13.75
IV.APEC.HHN. ML:1.0 0.00005355 0.2 AML other m 2021-10-26T03:14:19.50
IV.APEC.HHE. ML:1.3 0.000103 0.26 AML other m 2021-10-26T03:14:19.45
IV.ASQU.HHE. ML:0.5 0.00001735 1.18 AML other m 2021-10-26T03:14:20.64
IV.CAFI.HHE. ML:0.8 0.0000258 0.72 AML other m 2021-10-26T03:14:20.44
IV.CAFI.HHN. ML:0.8 0.0000275 0.14 AML other m 2021-10-26T03:14:20.38
IV.ASQU.HHN. ML:0.5 0.000014115000000000001 1.26 AML other m 2021-10-26T03:14:20.92
IV.PE3.EHE. ML:1.4 0.00009808500000000001 0.32 AML other m 2021-10-26T03:14:21.38
IV.PE3.EHN. ML:1.5 0.00011435 0.34 AML other m 2021-10-26T03:14:21.55
IV.PIEI.HHN. ML:0.9 0.00003115 0.1 AML other m 2021-10-26T03:14:21.61
IV.PIEI.HHE. ML:0.9 0.00002995 0.78 AML other m 2021-10-26T03:14:22.03
IV.NARO.HHN. ML:0.9 0.0000235 0.54 AML other m 2021-10-26T03:14:22.51
IV.NARO.HHE. ML:0.8 0.000018250000000000003 0.48 AML other m 2021-10-26T03:14:23.16
GU.MAIM.HHN. ML:1.9 0.00004765 0.36 AML other m 2021-10-26T03:14:32.81
GU.MAIM.HHE. ML:1.7 0.00003665 0.7 AML other m 2021-10-26T03:14:32.87
IV.PII.HHN. ML:2.2 0.00011954999999999999 0.38 AML other m 2021-10-26T03:14:32.98
IV.PII.HHE. ML:2.2 0.0001114 0.24 AML other m 2021-10-26T03:14:33.12
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