Earthquake with magnitude of ML 0.9 on date 21-09-2021 and time 10:41:10 (Italy) in region 2 km W Valfabbrica (PG)

A magnitude ML 0.9 earthquake occured in region: 2 km W Valfabbrica (PG), on

  • 21-09-2021 08:41:10 (UTC)
  • 21-09-2021 10:41:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.163, 12.575 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Valfabbrica PG 2 3389 3389
Assisi PG 11 28299 31688
Bastia Umbra PG 11 21874 53562
Perugia PG 16 166134 219696
Bettona PG 18 4367 224063
Nocera Umbra PG 18 5839 229902
Cannara PG 19 4305 234207
Valtopina PG 19 1398 235605
Gualdo Tadino PG 19 15208 250813
Torgiano PG 19 6725 257538

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Perugia (166134 inhabitants)
25 Km NW of Foligno (57155 inhabitants)
65 Km SE of Arezzo (99543 inhabitants)
67 Km N of Terni (111501 inhabitants)
84 Km SW of Fano (60888 inhabitants)
88 Km SW of Pesaro (94582 inhabitants)
91 Km NE of Viterbo (67173 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
100 Km S of Rimini (147750 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 2021-09-21
08:41:10
43.1633 12.5752 10 2021-09-21
08:50:00
Sala Sismica INGV-Roma 95691361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 08:41:10 ± 0.07
Latitude 43.1633 ± 0.0045
Longitude 12.5752 ± 0.0062
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95691361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 590
Semi-minor axis of confidence ellipse (meter) 329
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 233
Circular confidence region, given by single value of horizontal uncertainty (meter) 590
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 146
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.31296
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 95691361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 08:50:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RM33.EHZ. 2021-09-21T08:41:35.07 3.0 undecidable manual S -0.02 0
IV.ATBU.EHN. 2021-09-21T08:41:22.31 0.6 undecidable manual S 356 0.313 50 0.31 46
IV.SSFR.HHE. 2021-09-21T08:41:21.76 0.1 undecidable manual S 29 0.3121 50 -0.21 94
IV.ATVO.HHZ. 2021-09-21T08:41:20.13 0.3 undecidable manual S 331 0.2509 50 -0.03 74
IV.ATVA.EHE. 2021-09-21T08:41:19.65 0.1 undecidable manual S 299 0.2401 50 -0.21 96
IV.SNTG.HHZ. 2021-09-21T08:41:19.42 3.0 undecidable manual S 0
IV.ATLO.EHE. 2021-09-21T08:41:18.15 0.1 undecidable manual S 321 0.1952 115 -0.25 96
IV.ATBU.EHN. 2021-09-21T08:41:17.04 0.6 undecidable manual P 356 0.313 50 0.07 49
IV.SSFR.HHE. 2021-09-21T08:41:17.15 0.6 undecidable manual P 29 0.3121 50 0.2 47
IV.ATVA.EHE. 2021-09-21T08:41:16.08 0.3 undecidable manual P 299 0.2401 50 0.35 70
IV.ASSB.HHZ. 2021-09-21T08:41:16.28 0.1 undecidable manual S 153 0.1349 124 -0.12 100
IV.SNTG.HHZ. 2021-09-21T08:41:15.50 3.0 undecidable manual P 0
IV.ATVO.HHZ. 2021-09-21T08:41:15.74 1.0 undecidable manual P 331 0.2509 50 -0.17 24
IV.MURB.HHZ. 2021-09-21T08:41:15.83 0.3 undecidable manual S 340 0.1061 131 0.32 72
IV.ATCC.EHZ. 2021-09-21T08:41:14.00 0.1 undecidable manual S 65 0.0522 151 -0.17 100
IV.ATLO.EHE. 2021-09-21T08:41:14.77 0.1 undecidable manual P 321 0.1952 115 -0.12 98
IV.ASSB.HHZ. 2021-09-21T08:41:13.86 0.1 undecidable manual P 153 0.1349 124 0.13 99
IV.MURB.HHZ. 2021-09-21T08:41:13.41 0.1 negative manual P 340 0.1061 131 0.19 99
IV.ATCC.EHZ. 2021-09-21T08:41:12.55 0.6 undecidable manual P 65 0.0522 151 0.1 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATCC.EHN. ML:0.7 7.6012185E-5 0.0832 AML other m 2021-09-21T08:41:14.17
IV.ATCC.EHE. ML:0.8 9.0887785E-5 0.256 AML other m 2021-09-21T08:41:14.85
IV.MURB.HHE. ML:1 0.0001225 1.66 AML other m 2021-09-21T08:41:16.91
IV.MURB.HHN. ML:1.1 0.000129 0.16 AML other m 2021-09-21T08:41:16.40
IV.MURB.HNE. ML:1 0.00012048528 0.2496 AML other m 2021-09-21T08:41:15.91
IV.MURB.HNN. ML:1 0.000113815 0.576 AML other m 2021-09-21T08:41:18.18
IV.ASSB.HHE. ML:0.4 2.626032E-5 0.0576 AML other m 2021-09-21T08:41:17.02
IV.ASSB.HHN. ML:0.8 6.042678E-5 0.1024 AML other m 2021-09-21T08:41:16.36
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