Earthquake with magnitude of ML 0.2 on date 23-09-2021 and time 02:53:34 (Italy) in region 8 km E Valtopina (PG)

A magnitude ML 0.2 earthquake occured in region: 8 km E Valtopina (PG), on

  • 23-09-2021 00:53:34 (UTC)
  • 23-09-2021 02:53:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.026, 12.841 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
Valtopina PG 8 1398 1398
Nocera Umbra PG 10 5839 7237
Serravalle di Chienti MC 11 1070 8307
Foligno PG 14 57155 65462
Monte Cavallo MC 14 145 65607
Spello PG 14 8645 74252
Sefro MC 16 422 74674
Sellano PG 17 1079 75753
Pieve Torina MC 17 1458 77211
Muccia MC 18 915 78126
Trevi PG 18 8469 86595
Assisi PG 19 28299 114894
Fiuminata MC 20 1402 116296

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km NE of Foligno (57155 inhabitants)
38 Km E of Perugia (166134 inhabitants)
54 Km NE of Terni (111501 inhabitants)
81 Km NW of Teramo (54892 inhabitants)
86 Km SW of Ancona (100861 inhabitants)
88 Km NW of L'Aquila (69753 inhabitants)
90 Km NE of Viterbo (67173 inhabitants)
92 Km SE of Arezzo (99543 inhabitants)
92 Km S of Fano (60888 inhabitants)
99 Km S of Pesaro (94582 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 0.2 2021-09-23
00:53:34
43.0258 12.8408 9 2021-09-23
00:59:50
Sala Sismica INGV-Roma 95764151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-23 00:53:34 ± 0.09
Latitude 43.0258 ± 0.0045
Longitude 12.8408 ± 0.0037
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 95764151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 579
Semi-minor axis of confidence ellipse (meter) 67
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 203
Circular confidence region, given by single value of horizontal uncertainty (meter) 580
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 203
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27339
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.2

Field Value
Value 0.2
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 95764151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-23 00:59:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
AC.VLO.HHZ. 2021-09-23T00:54:59.82 3.0 negative manual Pn 2.09 0
IV.ICAI.EHZ. 2021-09-23T00:54:55.52 3.0 undecidable manual Sg 3.06 0
IV.PAOL.HHZ. 2021-09-23T00:54:51.21 3.0 undecidable manual Sg 0.1 0
IV.PTRJ.HNZ. 2021-09-23T00:54:44.98 3.0 undecidable manual Sg 0.97 0
IV.GRIS.EHZ. 2021-09-23T00:54:43.36 3.0 undecidable manual Pg 6.88 0
IX.PGN3.HHZ.02 2021-09-23T00:54:28.62 3.0 undecidable manual Pn 1.64 0
OX.PLRO.HHZ. 2021-09-23T00:54:19.41 3.0 undecidable manual Pn 2.11 0
IV.PTRJ.HNZ. 2021-09-23T00:54:08.50 3.0 undecidable manual Pn -1.79 0
IV.CSP1.EHZ. 2021-09-23T00:53:45.50 0.6 undecidable manual S 76 0.2734 50 0.05 49
IV.ATCC.EHZ. 2021-09-23T00:53:43.42 0.6 undecidable manual S 317 0.2167 111 -0.03 50
IV.FDMO.HHZ. 2021-09-23T00:53:42.15 0.3 undecidable manual S 87 0.1808 115 -0.03 76
IV.MML1.EHZ. 2021-09-23T00:53:40.40 0.6 undecidable manual S 47 0.1295 123 -0.06 51
IV.CSP1.EHZ. 2021-09-23T00:53:40.69 0.3 undecidable manual P 76 0.2734 50 -0.13 73
IV.ATCC.EHZ. 2021-09-23T00:53:39.63 0.3 undecidable manual P 317 0.2167 111 -0.04 75
IV.CESI.HHZ. 2021-09-23T00:53:38.18 0.3 undecidable manual S 114 0.0513 149 -0.13 76
IV.MML1.EHZ. 2021-09-23T00:53:38.07 0.1 undecidable manual P 47 0.1295 123 0.12 100
IV.FDMO.HHZ. 2021-09-23T00:53:38.97 0.6 positive manual P 87 0.1808 115 0.04 50
IV.CESI.HHZ. 2021-09-23T00:53:36.87 0.3 negative manual P 114 0.0513 149 0.17 75
IV.MURB.HNZ. 2021-09-23T00:53:30.92 3.0 undecidable manual P -0.94 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.2 2.665E-5 0.46 AML other m 2021-09-23T00:53:39.67
IV.CESI.HHN. ML:0.3 3.675E-5 1.4 AML other m 2021-09-23T00:53:40.73
IV.MML1.EHE. ML:0.3 2.047559E-5 1.14 AML other m 2021-09-23T00:53:39.73
IV.MML1.EHN. ML:0.2 1.5428515E-5 0.88 AML other m 2021-09-23T00:53:41.65
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