Earthquake with magnitude of ML 0.9 on date 25-10-2021 and time 16:36:10 (Italy) in region 5 km SE Pieve Santo Stefano (AR)

A magnitude ML 0.9 earthquake occured in region: 5 km SE Pieve Santo Stefano (AR), on

  • 25-10-2021 14:36:10 (UTC)
  • 25-10-2021 16:36:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.635, 12.079 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.

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 5 3183 3183
Caprese Michelangelo AR 8 1426 4609
Sansepolcro AR 9 15884 20493
Anghiari AR 11 5638 26131
Badia Tedalda AR 12 1087 27218
San Giustino PG 12 11297 38515
Chiusi della Verna AR 14 2023 40538
Citerna PG 15 3531 44069
Chitignano AR 16 899 44968
Monterchi AR 17 1757 46725
Borgo Pace PU 18 606 47331
Subbiano AR 18 6331 53662
Casteldelci RN 19 407 54069
Verghereto FC 19 1907 55976
Capolona AR 19 5438 61414
Sestino AR 19 1355 62769
Castel Focognano AR 20 3149 65918

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NE of Arezzo (99543 inhabitants)
57 Km S of Cesena (96758 inhabitants)
62 Km SW of Rimini (147750 inhabitants)
64 Km NW of Perugia (166134 inhabitants)
66 Km S of Forlì (117913 inhabitants)
68 Km E of Firenze (382808 inhabitants)
70 Km NE of Siena (53903 inhabitants)
73 Km E of Scandicci (50609 inhabitants)
74 Km W of Pesaro (94582 inhabitants)
74 Km S of Faenza (58541 inhabitants)
79 Km W of Fano (60888 inhabitants)
83 Km E of Prato (191150 inhabitants)
85 Km SE of Imola (69797 inhabitants)
88 Km S of Ravenna (159116 inhabitants)
91 Km NW of Foligno (57155 inhabitants)
99 Km E of Pistoia (90315 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 0.9 2021-10-25
14:36:10
43.635 12.0792 9 2021-10-25
15:08:10
Sala Sismica INGV-Roma 96982681
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 14:36:10 ± 0.07
Latitude 43.6350 ± 0.0045
Longitude 12.0792 ± 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 96982681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 539
Semi-minor axis of confidence ellipse (meter) 339
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 2
Circular confidence region, given by single value of horizontal uncertainty (meter) 540
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.07195
Epicentral distance of station farthest from the epicenter (degree) 0.34444
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 96982681
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 15:08:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PIEI.HHZ. 2021-10-25T14:36:23.36 0.3 undecidable manual S 107 0.3444 50 0 72
IV.CAFI.HHZ. 2021-10-25T14:36:22.47 0.3 undecidable manual S 195 0.3166 50 -0.05 71
IV.ASQU.HHZ. 2021-10-25T14:36:20.96 0.6 undecidable manual S 308 0.2644 50 -0.02 48
IV.CAFI.HHZ. 2021-10-25T14:36:17.48 0.1 undecidable manual P 195 0.3166 50 0.12 94
IV.PIEI.HHZ. 2021-10-25T14:36:17.65 0.3 undecidable manual P 107 0.3444 50 -0.19 69
IV.ASQU.HHZ. 2021-10-25T14:36:16.44 0.3 undecidable manual P 308 0.2644 50 -0.03 72
IV.CPGN.EHZ. 2021-10-25T14:36:16.46 0.3 undecidable manual P 46 0.241 109 0.48 66
IV.CRE.HHZ. 2021-10-25T14:36:15.02 0.3 undecidable manual S 260 0.0935 132 -0.14 73
IV.PARC.HHZ. 2021-10-25T14:36:15.50 0.3 undecidable manual S 83 0.116 126 -0.34 70
IV.SSP9.EHZ. 2021-10-25T14:36:14.73 0.3 undecidable manual S 148 0.0719 140 0.16 73
IV.PARC.HHZ. 2021-10-25T14:36:13.43 0.1 undecidable manual P 83 0.116 126 -0.07 99
IV.CRE.HHZ. 2021-10-25T14:36:13.09 0.1 undecidable manual P 260 0.0935 132 -0.02 100
IV.SSP9.EHZ. 2021-10-25T14:36:12.91 0.3 undecidable manual P 148 0.0719 140 0.14 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRE.HHN. ML:1 0.000125 0.2 AML other m 2021-10-25T14:36:15.13
IV.CRE.HHE. ML:0.8 9.075E-5 0.72 AML other m 2021-10-25T14:36:15.52
IV.PARC.HHN. ML:0.9 9.485E-5 0.24 AML other m 2021-10-25T14:36:15.59
IV.PARC.HHE. ML:0.8 6.855E-5 0.36 AML other m 2021-10-25T14:36:16.01
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