Earthquake with magnitude of ML 1.1 on date 22-09-2021 and time 15:15:16 (Italy) in region 2 km N Spoleto (PG)

A magnitude ML 1.1 earthquake occured in region: 2 km N Spoleto (PG), on

  • 22-09-2021 13:15:16 (UTC)
  • 22-09-2021 15:15:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.757, 12.744 at 18 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
Spoleto PG 2 38218 38218
Campello sul Clitunno PG 8 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Scheggino PG 9 461 41685
Castel Ritaldi PG 9 3278 44963
Vallo di Nera PG 10 364 45327
Trevi PG 14 8469 53796
Ferentillo TR 16 1913 55709
Cerreto di Spoleto PG 16 1075 56784
Giano dell'Umbria PG 16 3846 60630
Poggiodomo PG 16 117 60747
Montefalco PG 17 5679 66426
Acquasparta TR 18 4778 71204
Montefranco TR 18 1276 72480
Massa Martana PG 18 3770 76250
Arrone TR 19 2763 79013

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km S of Foligno (57155 inhabitants)
23 Km NE of Terni (111501 inhabitants)
49 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
84 Km N of Guidonia Montecelio (88673 inhabitants)
88 Km N of Tivoli (56533 inhabitants)
98 Km N of Roma (2864731 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2021-09-22
13:15:16
42.7568 12.7435 18 2021-09-22
13:22:40
Sala Sismica INGV-Roma 95742231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-22 13:15:16 ± 0.24
Latitude 42.7568 ± 0.0135
Longitude 12.7435 ± 0.0184
Depth (km) 18 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95742231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1548
Semi-minor axis of confidence ellipse (meter) 1096
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 219
Circular confidence region, given by single value of horizontal uncertainty (meter) 1550
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 35
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.37592
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 95742231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-22 13:22:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MBAL.EHZ. 2021-09-22T13:16:54.20 3.0 undecidable manual Sg 13.29 0
IV.ACATE.HNZ. 2021-09-22T13:16:49.25 3.0 negative manual Pg 14.92 0
ST.RONC.EHZ. 2021-09-22T13:16:47.54 3.0 undecidable manual Sn -1.13 0
IV.CRND.HNZ. 2021-09-22T13:16:43.75 3.0 undecidable manual Sg 2.93 0
IV.BAG8.EHZ. 2021-09-22T13:16:41.06 3.0 undecidable manual Sn -4.94 0
GU.RNCA.HHZ. 2021-09-22T13:16:40.74 3.0 undecidable manual Sg 6.15 0
IV.MSAG.HHZ. 2021-09-22T13:16:39.37 3.0 undecidable manual Sg 10.51 0
IV.QLNO.HHZ. 2021-09-22T13:16:39.01 3.0 undecidable manual Sn -2.13 0
OT.OT05.EHZ. 2021-09-22T13:16:31.47 3.0 undecidable manual Sg 7.52 0
OT.OT17.EHZ. 2021-09-22T13:16:24.42 3.0 undecidable manual Sg 4.67 0
SI.MOSI.HHZ. 2021-09-22T13:16:16.95 3.0 positive manual Pg 2.28 0
IV.IOCA.HHZ. 2021-09-22T13:16:12.88 3.0 undecidable manual Sg 1.11 0
IV.MTSN.HHZ. 2021-09-22T13:16:05.23 3.0 positive manual Pg 1.91 0
IV.RNI2.HHZ. 2021-09-22T13:16:01.67 3.0 undecidable manual Sg 2.05 0
MN.TRI.HHZ. 2021-09-22T13:15:59.08 3.0 undecidable manual Pn -3.47 0
IV.TEOL.HHZ. 2021-09-22T13:15:56.35 3.0 negative manual Pg 0.73 0
IV.RAVA.EHZ. 2021-09-22T13:15:53.18 3.0 negative manual Pg 4.31 0
IV.MSAG.HHZ. 2021-09-22T13:15:49.16 3.0 undecidable manual Pn -5.88 0
IV.SGG.HHZ. 2021-09-22T13:15:40.44 3.0 positive manual Pn -2.36 0
IV.TST02.HHZ. 2021-09-22T13:15:39.46 3.0 undecidable manual Pg 0.26 0
IV.FIR.HHZ. 2021-09-22T13:15:33.13 3.0 undecidable manual Pn -3.17 0
IV.TOLF.HHZ. 2021-09-22T13:15:31.56 3.0 undecidable manual Sg -2.23 0
IV.FDMO.HHZ. 2021-09-22T13:15:29.98 0.6 undecidable manual S 42 0.3759 102 0.09 49
IV.ASSB.HHN. 2021-09-22T13:15:27.91 0.6 undecidable manual S 348 0.2923 107 0.42 46
IV.CESI.HHZ. 2021-09-22T13:15:26.77 0.6 undecidable manual S 25 0.2743 109 -0.22 48
IV.CESX.HHZ. 2021-09-22T13:15:25.06 0.3 undecidable manual S 218 0.188 120 0.41 71
IV.FDMO.HHZ. 2021-09-22T13:15:24.40 0.6 positive manual P 42 0.3759 102 0.33 46
IV.RDP.HHZ. 2021-09-22T13:15:23.47 3.0 positive manual P -4.53 0
IV.MOMA.HHZ. 2021-09-22T13:15:23.22 0.6 undecidable manual S 290 0.1358 132 -0.18 50
IV.GAVE.EHZ. 2021-09-22T13:15:22.99 0.6 undecidable manual S 120 0.1286 134 -0.25 50
IV.ASSB.HHN. 2021-09-22T13:15:22.32 0.1 undecidable manual P 348 0.2923 107 -0.36 94
IV.CESI.HHZ. 2021-09-22T13:15:22.60 0.6 undecidable manual P 25 0.2743 109 0.21 49
IV.CESX.HHZ. 2021-09-22T13:15:20.54 0.1 undecidable manual P 218 0.188 120 -0.5 93
IV.GAVE.EHZ. 2021-09-22T13:15:20.41 0.1 undecidable manual P 120 0.1286 134 0.19 100
IV.MOMA.HHZ. 2021-09-22T13:15:20.69 0.6 negative manual P 290 0.1358 132 0.38 48
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:0.9 5.395E-5 0.2 AML other m 2021-09-22T13:15:23.53
IV.MOMA.HHE. ML:1.2 0.0001255 0.24 AML other m 2021-09-22T13:15:23.74
IV.GAVE.EHE. ML:1 8.065E-5 0.2 AML other m 2021-09-22T13:15:24.30
IV.GAVE.EHN. ML:1 6.61E-5 0.12 AML other m 2021-09-22T13:15:24.41
IV.ARVD.HHN. ML:1.3 2.575E-5 0.42 AML other m 2021-09-22T13:15:32.61
IV.TST02.HHN. ML:3.4 0.00125 0.44 AML other m 2021-09-22T13:15:41.70
IV.TST02.HHE. ML:3.6 0.00172 1.24 AML other m 2021-09-22T13:15:42.70
IV.ARVD.HHE. ML:1.2 2.113E-5 0.68 AML other m 2021-09-22T13:16:15.41
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