Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 21-09-2021 and time 01:44:06 (UTC) in region 3 km NW Serravalle di Chienti (MC)

A magnitude ML 0.4 earthquake occured in region: 3 km NW Serravalle di Chienti (MC), on

  • 21-09-2021 01:44:06 (UTC)
  • 21-09-2021 03:44:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0940, 12.9220 at 12 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
Serravalle di Chienti MC 3 1070 1070
Sefro MC 6 422 1492
Muccia MC 10 915 2407
Fiuminata MC 11 1402 3809
Nocera Umbra PG 11 5839 9648
Pioraco MC 11 1134 10782
Pieve Torina MC 12 1458 12240
Camerino MC 13 6974 19214
Monte Cavallo MC 13 145 19359
Pievebovigliana MC 14 866 20225
Valtopina PG 14 1398 21623
Fiordimonte MC 15 202 21825
Castelraimondo MC 17 4587 26412
Esanatoglia MC 18 2034 28446
Gualdo Tadino PG 19 15208 43654
Matelica MC 20 9981 53635

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NE of Foligno (57155 inhabitants)
43 Km E of Perugia (166134 inhabitants)
63 Km NE of Terni (111501 inhabitants)
76 Km SW of Ancona (100861 inhabitants)
80 Km NW of Teramo (54892 inhabitants)
84 Km S of Fano (60888 inhabitants)
91 Km S of Pesaro (94582 inhabitants)
91 Km NW of L'Aquila (69753 inhabitants)
94 Km E of Arezzo (99543 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 0.4 2021-09-21
01:44:06		 43.0935 12.9222 12 2021-09-21
02:17:44		 Sala Sismica INGV-Roma 95682331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 01:44:06 ± 0.07
Latitude 43.0935 ± 0.0036
Longitude 12.9222 ± 0.0037
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95682331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 367
Semi-minor axis of confidence ellipse (meter) 229
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 4
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.04137
Epicentral distance of station farthest from the epicenter (degree) 0.20594
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 95682331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 02:17:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-09-21T01:44:15.14 0.3 undecidable manual S 90 22.8549 93 0.07 72
IV.ASSB.HHZ. 2021-09-21T01:44:14.77 0.3 undecidable manual S 255 22.0668 94 -0.08 73
IV.SNTG.HHZ. 2021-09-21T01:44:13.66 0.3 undecidable manual S 5 17.9709 96 -0.1 73
IV.FDMO.HHE. 2021-09-21T01:44:12.54 0.3 undecidable manual S 115 14.7741 103 -0.38 70
IV.ASSB.HHZ. 2021-09-21T01:44:11.30 0.1 undecidable manual P 255 22.0668 94 -0.02 99
IV.CSP1.EHZ. 2021-09-21T01:44:11.47 0.1 undecidable manual P 90 22.8549 93 0.02 97
IV.CESI.HHZ. 2021-09-21T01:44:11.66 0.3 undecidable manual S 188 9.9789 124 -0.08 75
IV.FDMO.HHE. 2021-09-21T01:44:10.17 0.1 undecidable manual P 115 14.7741 103 -0.04 100
IV.MML1.EHZ. 2021-09-21T01:44:10.85 0.3 undecidable manual S 61 4.5954 152 0.07 76
IV.SNTG.HHZ. 2021-09-21T01:44:10.67 0.1 undecidable manual P 5 17.9709 96 -0.02 99
IV.CESI.HHZ. 2021-09-21T01:44:09.60 0.1 undecidable manual P 188 9.9789 124 0.08 99
IV.MML1.EHZ. 2021-09-21T01:44:09.17 0.1 undecidable manual P 61 4.5954 152 0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MML1.EHE. ML:0.6 0.000062717995 0.2 AML other m 2021-09-21T01:44:11.05
IV.MML1.EHN. ML:0.3 0.000031570020000000006 0.1 AML other m 2021-09-21T01:44:11.13
IV.MML1.HNE. ML:0.8 0.000083895365 0.48 AML other m 2021-09-21T01:44:10.86
IV.CESI.HHE. ML:0.2 0.000020008070000000004 0.12 AML other m 2021-09-21T01:44:12.06
IV.CESI.HHN. ML:0.2 0.000018631594999999996 0.1 AML other m 2021-09-21T01:44:11.93
IV.ASSB.HHE. ML:0.2 0.000010452240499999999 0.18 AML other m 2021-09-21T01:44:15.22
IV.ASSB.HHN. ML:0.4 0.000013511225 0.92 AML other m 2021-09-21T01:44:20.67
IV.CSP1.EHN. ML:1.2 0.00008909966 1.98 AML other m 2021-09-21T01:44:19.62
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