Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 27-10-2021 and time 14:50:35 (Italy) in region 6 km E Città di Castello (PG)

A magnitude ML 0.9 earthquake occured in region: 6 km E Città di Castello (PG), on

  • 27-10-2021 12:50:35 (UTC)
  • 27-10-2021 14:50:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4800, 12.3130 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
Città di Castello PG 6 39913 39913
Pietralunga PG 11 2111 42024
Apecchio PU 12 1882 43906
Montone PG 13 1680 45586
Monte Santa Maria Tiberina PG 13 1183 46769
San Giustino PG 13 11297 58066
Citerna PG 16 3531 61597
Monterchi AR 16 1757 63354
Sansepolcro AR 17 15884 79238
Mercatello sul Metauro PU 19 1378 80616
Umbertide PG 19 16681 97297
Borgo Pace PU 20 606 97903

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km E of Arezzo (99543 inhabitants)
42 Km N of Perugia (166134 inhabitants)
66 Km NW of Foligno (57155 inhabitants)
68 Km SW of Rimini (147750 inhabitants)
68 Km SW of Pesaro (94582 inhabitants)
70 Km SW of Fano (60888 inhabitants)
73 Km S of Cesena (96758 inhabitants)
81 Km E of Siena (53903 inhabitants)
86 Km S of Forlì (117913 inhabitants)
91 Km E of Firenze (382808 inhabitants)
96 Km SE of Faenza (58541 inhabitants)
96 Km E of Scandicci (50609 inhabitants)
99 Km W of Ancona (100861 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 0.9 2021-10-27
12:50:35		 43.4798 12.3127 9 2021-10-27
13:02:02		 Sala Sismica INGV-Roma 97021531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-27 12:50:35 ± 0.12
Latitude 43.4798 ± 0.0045
Longitude 12.3127 ± 0.0037
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97021531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 420
Semi-minor axis of confidence ellipse (meter) 262
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 8
Circular confidence region, given by single value of horizontal uncertainty (meter) 420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 135
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30217
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 97021531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-27 13:02:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
SI.ROSI.HHZ. 2021-10-27T12:52:01.26 3.0 undecidable manual Sn -9.25 0
MN.CLTB.HHZ. 2021-10-27T12:51:57.30 3.0 negative manual Pg 6.66 0
IX.RSF3.HHZ.02 2021-10-27T12:51:55.60 3.0 undecidable manual Sn 0.53 0
IV.MARS.HNZ. 2021-10-27T12:51:52.13 3.0 undecidable manual Pg 4.68 0
IV.HAGA.HHZ. 2021-10-27T12:51:49.53 3.0 undecidable manual Pn -9.99 0
MN.TRI.HHZ. 2021-10-27T12:51:48.10 3.0 undecidable manual Sn 1.14 0
IV.CADC.EHZ. 2021-10-27T12:51:44.59 3.0 undecidable manual Sg 1.51 0
IV.PAOL.HHZ. 2021-10-27T12:51:40.17 3.0 undecidable manual Sn -5.95 0
IV.ZEN8.EHZ. 2021-10-27T12:51:38.53 3.0 undecidable manual Sn -3.98 0
IV.NDIM.HHZ. 2021-10-27T12:51:25.58 3.0 undecidable manual Sg 1.07 0
IX.STN3.HNZ.01 2021-10-27T12:51:22.42 3.0 undecidable manual Pn -2.52 0
ST.GAGG.HHZ. 2021-10-27T12:51:19.39 3.0 undecidable manual Pg 4.08 0
IV.SARZ.HNZ. 2021-10-27T12:51:11.69 3.0 undecidable manual Pg -0.83 0
IV.TREG.EHZ. 2021-10-27T12:51:10.94 3.0 undecidable manual Pg 3.56 0
IV.IMOL.HNZ. 2021-10-27T12:51:06.46 3.0 undecidable manual S -1.14 0
IV.PAOL.HHZ. 2021-10-27T12:51:05.73 3.0 undecidable manual Pn -6.46 0
IV.CPGN.EHZ. 2021-10-27T12:50:57.93 3.0 undecidable manual S 3.98 0
IV.PARC.HHZ. 2021-10-27T12:50:42.97 0.6 undecidable manual S 342 19.6692 115 -0.09 49
IV.FRON.EHZ. 2021-10-27T12:50:41.86 1.0 negative manual P 83 33.5442 50 -0.45 22
IV.PARC.HHZ. 2021-10-27T12:50:40.24 0.6 undecidable manual P 342 19.6692 115 0.37 46
IV.ATPC.HNN. 2021-10-27T12:50:40.73 0.6 undecidable manual S 89 11.5773 129 0.05 50
IV.ATMC.EHN. 2021-10-27T12:50:40.37 0.6 undecidable manual S 249 10.2786 132 0.03 50
IV.BADI.EHZ. 2021-10-27T12:50:39.20 0.6 undecidable manual S 301 6.3936 145 -0.24 48
IV.ATPI.EHZ. 2021-10-27T12:50:39.67 0.6 undecidable manual S 114 7.881 140 -0.08 50
IV.PIEI.HHZ. 2021-10-27T12:50:39.70 0.6 undecidable manual P 71 18.9699 116 -0.04 49
IV.APEC.HHZ. 2021-10-27T12:50:38.57 0.3 undecidable manual P 45 12.2766 127 -0.03 75
IV.ATMC.EHN. 2021-10-27T12:50:38.31 0.3 undecidable manual P 249 10.2786 132 0.01 75
IV.ATPI.EHZ. 2021-10-27T12:50:38.00 0.1 undecidable manual P 114 7.881 140 0.04 100
IV.ATPC.HNN. 2021-10-27T12:50:38.57 0.3 undecidable manual P 89 11.5773 129 0.08 74
IV.BADI.EHZ. 2021-10-27T12:50:37.79 0.3 undecidable manual P 301 6.3936 145 0.01 76
IV.RIBO.EHZ.01 2021-10-27T12:50:25.33 3.0 positive manual P -9.99 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATPI.EHE. ML:1.0 0.00016008855 0.0768 AML other m 2021-10-27T12:50:39.83
IV.ATPI.EHN. ML:0.8 0.00009944731500000001 0.0832 AML other m 2021-10-27T12:50:39.72
IV.ATPI.HNE. ML:1.0 0.0001588769 0.0704 AML other m 2021-10-27T12:50:39.79
IV.ATPI.HNN. ML:0.9 0.000123971115 0.0768 AML other m 2021-10-27T12:50:39.72
IV.APEC.HNE. ML:1.8 0.00077686939 1.4784 AML other m 2021-10-27T12:50:47.70
IV.APEC.HHE. ML:0.9 0.00008480857999999999 0.1408 AML other m 2021-10-27T12:50:40.95
IV.APEC.HHN. ML:0.8 0.0000758595 0.1216 AML other m 2021-10-27T12:50:40.84
IV.PIEI.HHE. ML:0.6 0.000033453139999999996 0.16 AML other m 2021-10-27T12:50:43.45
IV.PIEI.HHN. ML:0.4 0.000018891905 1.3824 AML other m 2021-10-27T12:51:02.63
IV.PARC.HHE. ML:0.7 0.000038996925 1.504 AML other m 2021-10-27T12:50:56.08
IV.PARC.HHN. ML:0.4 0.000017903035999999996 0.2624 AML other m 2021-10-27T12:50:43.03
IV.FRON.EHN. ML:1.1 0.000053187079999999996 1.7216 AML other m 2021-10-27T12:50:50.32
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