Earthquake with magnitude of ML 1.8 on date 16-09-2021 and time 12:11:02 (Italy) in region 2 km NE Polino (TR)

A magnitude ML 1.8 earthquake occured in region: 2 km NE Polino (TR), on

  • 16-09-2021 10:11:02 (UTC)
  • 16-09-2021 12:11:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.601, 12.862 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
Arrone TR 8 2763 4909
Montefranco TR 8 1276 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
Greccio RI 18 1558 19262
Spoleto PG 18 38218 57480
Cascia PG 18 3217 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 1.8 2021-09-16
10:11:02
42.601 12.8623 16 2021-09-16
10:24:59
Sala Sismica INGV-Roma 95504121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-16 10:11:02 ± 0.06
Latitude 42.6010 ± 0.0045
Longitude 12.8623 ± 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 95504121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 388
Semi-minor axis of confidence ellipse (meter) 367
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 184
Circular confidence region, given by single value of horizontal uncertainty (meter) 390
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.54589
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 95504121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-16 10:24:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IT.FIE.HGZ. 2021-09-16T10:11:49.11 3.0 undecidable manual Sg 0.73 0
IV.TERO.HHZ. 2021-09-16T10:11:21.28 0.6 undecidable manual S 87 0.5459 96 0.26 44
IV.FIAM.HHZ. 2021-09-16T10:11:16.40 0.6 undecidable manual S 150 0.3822 99 0.19 47
IV.RM33.EHZ. 2021-09-16T10:11:13.17 0.6 undecidable manual S 109 0.2752 105 0.07 49
IV.CSP1.EHZ. 2021-09-16T10:11:13.35 3.0 undecidable manual S -1.35 0
IV.NRCA.HHZ. 2021-09-16T10:11:13.65 0.6 undecidable manual S 38 0.2968 103 -0.09 48
IV.TERO.HHZ. 2021-09-16T10:11:12.97 0.3 undecidable manual P 87 0.5459 96 -0.15 68
IV.CESX.HHZ. 2021-09-16T10:11:11.14 0.6 undecidable manual S 272 0.2032 113 0.06 49
IV.FDMO.HHZ. 2021-09-16T10:11:11.81 3.0 undecidable manual S 0.38 0
IV.FIAM.HHZ. 2021-09-16T10:11:10.35 0.1 undecidable manual P 150 0.3822 99 0.01 96
IV.MMUR.HNZ. 2021-09-16T10:11:09.42 3.0 undecidable manual P -2.05 0
IV.LNSS.HHZ. 2021-09-16T10:11:09.23 0.6 undecidable manual S 89 0.1313 128 -0.01 50
IV.ARRO.EHZ. 2021-09-16T10:11:08.05 0.6 undecidable manual S 253 0.0746 147 -0.06 50
IV.NRCA.HHZ. 2021-09-16T10:11:08.98 0.6 undecidable manual P 38 0.2968 103 0.07 48
IV.GAVE.EHZ. 2021-09-16T10:11:08.34 0.6 undecidable manual S 14 0.0944 140 -0.12 50
IV.RM33.EHZ. 2021-09-16T10:11:08.08 0.6 undecidable manual P 109 0.2752 105 -0.47 44
IV.CESX.HHZ. 2021-09-16T10:11:07.37 0.1 undecidable manual P 272 0.2032 113 -0.01 100
IV.LNSS.HHZ. 2021-09-16T10:11:06.42 0.3 undecidable manual P 89 0.1313 128 0.1 74
IV.ARRO.EHZ. 2021-09-16T10:11:05.74 0.3 undecidable manual P 253 0.0746 147 0.07 76
IV.GAVE.EHZ. 2021-09-16T10:11:05.95 0.1 undecidable manual P 14 0.0944 140 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:1.8 0.00055853135 0.2048 AML other m 2021-09-16T10:11:08.52
IV.ARRO.EHN. ML:1.6 0.0004247073 0.1344 AML other m 2021-09-16T10:11:08.98
IV.LNSS.HHE. ML:1.8 0.00044557585 0.1856 AML other m 2021-09-16T10:11:09.70
IV.LNSS.HHN. ML:1.8 0.00048341835 0.16 AML other m 2021-09-16T10:11:09.80
IV.CESX.HHE. ML:1.6 0.0002355 0.18 AML other m 2021-09-16T10:11:11.39
IV.CESX.HHN. ML:1.8 0.0003623683 0.1984 AML other m 2021-09-16T10:11:11.38
IV.RM33.EHE. ML:1.8 0.00028 0.24 AML other m 2021-09-16T10:11:13.47
IV.NRCA.HHN. ML:1.9 0.0003485113 0.096 AML other m 2021-09-16T10:11:13.96
IV.RM33.EHN. ML:1.6 0.0001577712 0.2752 AML other m 2021-09-16T10:11:15.23
IV.NRCA.HHE. ML:2 0.0003576623 0.16 AML other m 2021-09-16T10:11:15.40
IV.FIAM.HHN. ML:1.2 4.705023E-5 0.3008 AML other m 2021-09-16T10:11:16.62
IV.FIAM.HHE. ML:1.1 4.246807E-5 0.1984 AML other m 2021-09-16T10:11:18.46
IV.GAVE.EHE. ML:2 0.00086009195 0.1216 AML other m 2021-09-16T10:11:08.80
IV.GAVE.EHN. ML:2.1 0.0011320497 0.1408 AML other m 2021-09-16T10:11:08.66
IV.GAVE.HNE. ML:2 0.00081281735 0.1152 AML other m 2021-09-16T10:11:08.73
IV.GAVE.HNN. ML:1.6 0.0003342806 0.1472 AML other m 2021-09-16T10:11:08.66
IV.LNSS.HNE. ML:1.8 0.0004407923125 0.1344 AML other m 2021-09-16T10:11:09.70
IV.LNSS.HNN. ML:1.6 0.00029865195 1.9712 AML other m 2021-09-16T10:11:13.81
IV.RM33.HNE. ML:1.8 0.00030367455 0.2112 AML other m 2021-09-16T10:11:13.58
IV.RM33.HNN. ML:1.6 0.00017839775 0.288 AML other m 2021-09-16T10:11:15.22
IV.NRCA.HNE. ML:2 0.0003555805 0.1472 AML other m 2021-09-16T10:11:15.32
IV.NRCA.HNN. ML:1.9 0.0003255081 0.1216 AML other m 2021-09-16T10:11:13.90
IV.FIAM.HNE. ML:2.7 0.001663246 1.2096 AML other m 2021-09-16T10:11:29.00
IV.FIAM.HNN. ML:1.7 0.00015686942 0.8 AML other m 2021-09-16T10:11:16.63
IV.TERO.HHE. ML:1.8 0.000111917775 0.3584 AML other m 2021-09-16T10:11:20.16
IV.TERO.HHN. ML:1.4 4.8738575E-5 0.1792 AML other m 2021-09-16T10:11:21.62
IV.TERO.HNE. ML:1.8 0.000108961695 0.768 AML other m 2021-09-16T10:11:30.75
IV.TERO.HNN. ML:1.8 0.000128341 0.4288 AML other m 2021-09-16T10:11:27.22
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