Earthquake with magnitude of ML 1.1 on date 16-09-2021 and time 10:05:51 (UTC) in region 2 km NE Polino (TR)

A magnitude ML 1.1 earthquake occured in region: 2 km NE Polino (TR), on

  • 16-09-2021 10:05:51 (UTC)
  • 16-09-2021 12:05:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.602, 12.864 at 16 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
Polino TR 2 233 233
Ferentillo TR 6 1913 2146
Montefranco TR 8 1276 3422
Arrone TR 8 2763 6185
Morro Reatino RI 9 373 6558
Monteleone di Spoleto PG 9 599 7157
Leonessa RI 9 2435 9592
Rivodutri RI 9 1253 10845
Labro RI 10 374 11219
Poggio Bustone RI 11 2055 13274
Scheggino PG 13 461 13735
Colli sul Velino RI 13 533 14268
Poggiodomo PG 14 117 14385
Sant'Anatolia di Narco PG 15 564 14949
Cantalice RI 15 2755 17704
Cascia PG 18 3217 20921
Spoleto PG 18 38218 59139
Greccio RI 18 1558 60697
Terni TR 18 111501 172198
Vallo di Nera PG 19 364 172562
Stroncone TR 20 4917 177479

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km E of Terni (111501 inhabitants)
42 Km SE of Foligno (57155 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
65 Km E of Viterbo (67173 inhabitants)
68 Km N of Guidonia Montecelio (88673 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
69 Km W of Teramo (54892 inhabitants)
71 Km N of Tivoli (56533 inhabitants)
85 Km NE 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 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 1.1 2021-09-16
10:05:51
42.6017 12.8643 16 2021-09-16
10:12:10
Sala Sismica INGV-Roma 95503161
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-16 10:05:51 ± 0.06
Latitude 42.6017 ± 0.0036
Longitude 12.8643 ± 0.0037
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95503161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 325
Semi-minor axis of confidence ellipse (meter) 236
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 328
Circular confidence region, given by single value of horizontal uncertainty (meter) 330
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.46405
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 95503161
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-16 10:12:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-09-16T10:06:08.26 0.6 undecidable manual S 21 0.4641 97 0.28 44
IV.SNTG.HHZ. 2021-09-16T10:06:05.01 3.0 undecidable manual P 0.28 0
IV.NRCA.HHZ. 2021-09-16T10:06:02.90 0.6 undecidable manual S 38 0.2959 103 -0.15 47
IV.FDMO.HHZ. 2021-09-16T10:06:01.00 0.1 undecidable manual P 21 0.4641 97 -0.09 92
IV.CESX.HHZ. 2021-09-16T10:06:00.46 0.6 undecidable manual S 272 0.2041 112 0 49
IV.FIAM.HHZ. 2021-09-16T10:05:59.68 0.6 negative manual P 151 0.3822 99 -0.02 48
IV.NRCA.HHZ. 2021-09-16T10:05:58.16 0.1 undecidable manual P 38 0.2959 103 -0.09 95
IV.LNSS.HHZ. 2021-09-16T10:05:58.52 0.6 undecidable manual S 89 0.1295 128 -0.02 50
IV.GAVE.EHZ. 2021-09-16T10:05:57.75 0.6 undecidable manual S 14 0.0935 140 -0.01 50
IV.ARRO.EHZ. 2021-09-16T10:05:57.37 0.6 undecidable manual S 253 0.0764 146 -0.09 49
IV.CESX.HHZ. 2021-09-16T10:05:56.74 0.6 negative manual P 272 0.2041 112 -0.02 49
IV.ARRO.EHZ. 2021-09-16T10:05:55.07 0.1 negative manual P 253 0.0764 146 0.05 100
IV.GAVE.EHZ. 2021-09-16T10:05:55.27 0.1 positive manual P 14 0.0935 140 0.07 99
IV.LNSS.HHZ. 2021-09-16T10:05:55.73 0.1 undecidable manual P 89 0.1295 128 0.09 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:1 8.725E-5 0.24 AML other m 2021-09-16T10:05:57.85
IV.ARRO.EHN. ML:0.8 5.72E-5 0.12 AML other m 2021-09-16T10:05:57.77
IV.GAVE.EHN. ML:1.3 0.000188 1.64 AML other m 2021-09-16T10:05:57.12
IV.GAVE.EHE. ML:1.2 0.0001475 0.82 AML other m 2021-09-16T10:05:58.03
IV.LNSS.HHE. ML:1.1 9.835E-5 0.58 AML other m 2021-09-16T10:05:58.90
IV.LNSS.HHN. ML:1.1 9.34E-5 0.58 AML other m 2021-09-16T10:05:59.37
IV.CESX.HHE. ML:0.8 3.74E-5 0.2 AML other m 2021-09-16T10:06:00.69
IV.CESX.HHN. ML:0.9 5.19E-5 0.48 AML other m 2021-09-16T10:06:00.69
IV.NRCA.HHN. ML:1.2 6.19E-5 0.72 AML other m 2021-09-16T10:06:03.23
IV.NRCA.HHE. ML:1.1 5.655E-5 0.82 AML other m 2021-09-16T10:06:04.26
IV.SNTG.HHE. ML:1.1 1.78E-5 0.56 AML other m 2021-09-16T10:06:08.52
IV.SNTG.HHN. ML:1 1.6955E-5 0.7 AML other m 2021-09-16T10:06:09.45
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