Earthquake with magnitude of ML 1.2 on date 01-09-2021 and time 02:05:47 (UTC) in region Acquasparta (TR)

A magnitude ML 1.2 earthquake occured in region: Acquasparta (TR), on

  • 01-09-2021 02:05:47 (UTC)
  • 01-09-2021 04:05:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.69, 12.544 at 8 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
Acquasparta TR 0 4778 4778
Montecastrilli TR 6 5022 9800
San Gemini TR 8 5018 14818
Massa Martana PG 10 3770 18588
Avigliano Umbro TR 10 2558 21146
Todi PG 15 16851 37997
Giano dell'Umbria PG 16 3846 41843
Terni TR 17 111501 153344
Spoleto PG 17 38218 191562
Amelia TR 18 11897 203459
Castel Ritaldi PG 18 3278 206737
Narni TR 19 19785 226522

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km NW of Terni (111501 inhabitants)
32 Km SW of Foligno (57155 inhabitants)
47 Km NE of Viterbo (67173 inhabitants)
48 Km S of Perugia (166134 inhabitants)
78 Km N of Guidonia Montecelio (88673 inhabitants)
80 Km W of L'Aquila (69753 inhabitants)
83 Km N of Tivoli (56533 inhabitants)
89 Km N of Roma (2864731 inhabitants)
91 Km NE of Civitavecchia (52991 inhabitants)
95 Km W of Teramo (54892 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 1.2 2021-09-01
02:05:47
42.6897 12.5438 8 2021-09-01
02:10:04
Sala Sismica INGV-Roma 94893211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-01 02:05:47 ± 0.1
Latitude 42.6897 ± 0.0045
Longitude 12.5438 ± 0.0110
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94893211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 950
Semi-minor axis of confidence ellipse (meter) 349
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 73
Circular confidence region, given by single value of horizontal uncertainty (meter) 950
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 146
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.08723
Epicentral distance of station farthest from the epicenter (degree) 0.62863
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 94893211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-01 02:10:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-09-01T02:06:07.91 0.6 undecidable manual S 359 0.5729 50 0.34 43
IV.ASSB.HHZ. 2021-09-01T02:06:01.18 0.6 undecidable manual S 13 0.3624 50 -0.15 47
IV.CSP1.EHZ. 2021-09-01T02:06:00.57 1.0 negative manual P 50 0.6286 50 0.52 21
IV.MURB.HHZ. 2021-09-01T02:05:59.02 0.1 undecidable manual P 359 0.5729 50 -0.07 92
IV.FDMO.HHZ. 2021-09-01T02:05:58.67 1.0 positive manual P 49 0.5279 50 0.35 22
IV.ARRO.EHZ. 2021-09-01T02:05:55.42 0.6 undecidable manual S 124 0.197 111 -0.21 48
IV.ASSB.HHZ. 2021-09-01T02:05:55.22 0.3 negative manual P 13 0.3624 50 -0.27 69
IV.MGAB.HHZ. 2021-09-01T02:05:55.66 1.0 undecidable manual P 305 0.3867 50 -0.25 23
IV.GAVE.EHZ. 2021-09-01T02:05:53.47 1.0 undecidable manual P 89 0.2572 106 -0.01 25
IV.MOMA.HHZ. 2021-09-01T02:05:52.71 0.6 undecidable manual S 10 0.116 123 -0.11 50
IV.ARRO.EHZ. 2021-09-01T02:05:52.28 0.6 positive manual P 124 0.197 111 0.08 49
IV.CESX.HHZ. 2021-09-01T02:05:51.98 0.6 undecidable manual S 159 0.0872 131 0.04 51
IV.CESX.HHZ. 2021-09-01T02:05:50.13 0.3 positive manual P 159 0.0872 131 0.06 76
IV.MOMA.HHZ. 2021-09-01T02:05:50.68 0.1 positive manual P 10 0.116 123 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:1.4 0.0002765 0.2 AML other m 2021-09-01T02:05:52.86
IV.MOMA.HNN. ML:1.4 0.000278 0.76 AML other m 2021-09-01T02:05:52.86
IV.CESX.HHE. ML:1.4 0.000326 1.42 AML other m 2021-09-01T02:05:53.15
IV.CESX.HHN. ML:1.4 0.0003325 0.2 AML other m 2021-09-01T02:05:53.23
IV.MOMA.HHE. ML:1.4 0.000282 0.44 AML other m 2021-09-01T02:05:54.15
IV.MOMA.HNE. ML:1.4 0.000266 0.9 AML other m 2021-09-01T02:05:54.15
IV.ARRO.EHE. ML:0.9 6.075E-5 1.78 AML other m 2021-09-01T02:05:56.97
IV.ARRO.EHN. ML:1 6.89E-5 1.24 AML other m 2021-09-01T02:05:57.98
IV.GAVE.EHE. ML:0.9 4.14E-5 0.14 AML other m 2021-09-01T02:05:59.60
IV.GAVE.EHN. ML:0.8 3.235E-5 0.54 AML other m 2021-09-01T02:05:59.76
IV.ASSB.HHE. ML:0.8 2.005E-5 0.22 AML other m 2021-09-01T02:06:01.20
IV.ASSB.HHN. ML:0.9 2.32E-5 0.86 AML other m 2021-09-01T02:06:01.13
IV.MGAB.HHN. ML:1 3.355E-5 0.18 AML other m 2021-09-01T02:06:02.54
IV.MGAB.HHE. ML:1 3.51E-5 0.32 AML other m 2021-09-01T02:06:05.32
IV.MURB.HHE. ML:1.5 5.705E-5 0.68 AML other m 2021-09-01T02:06:10.92
IV.MURB.HHN. ML:1.5 6.58E-5 0.22 AML other m 2021-09-01T02:06:13.95
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