Earthquake with magnitude of ML 1.0 on date 31-10-2021 and time 10:40:43 (UTC) in region 5 km NE Acquasparta (TR)

A magnitude ML 1.0 earthquake occured in region: 5 km NE Acquasparta (TR), on

  • 31-10-2021 10:40:43 (UTC)
  • 31-10-2021 11:40:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.719, 12.601 at 10 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 5 4778 4778
Massa Martana PG 9 3770 8548
Spoleto PG 12 38218 46766
Montecastrilli TR 12 5022 51788
San Gemini TR 12 5018 56806
Giano dell'Umbria PG 13 3846 60652
Castel Ritaldi PG 13 3278 63930
Avigliano Umbro TR 16 2558 66488
Todi PG 17 16851 83339
Terni TR 18 111501 194840
Campello sul Clitunno PG 18 2442 197282
Ferentillo TR 19 1913 199195
Scheggino PG 19 461 199656
Montefranco TR 19 1276 200932
Sant'Anatolia di Narco PG 19 564 201496
Montefalco PG 20 5679 207175

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km N of Terni (111501 inhabitants)
28 Km SW of Foligno (57155 inhabitants)
47 Km SE of Perugia (166134 inhabitants)
53 Km NE of Viterbo (67173 inhabitants)
77 Km NW of L'Aquila (69753 inhabitants)
81 Km N of Guidonia Montecelio (88673 inhabitants)
85 Km N of Tivoli (56533 inhabitants)
91 Km W of Teramo (54892 inhabitants)
92 Km N of Roma (2864731 inhabitants)
96 Km NE of Civitavecchia (52991 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 1.0 2021-10-31
10:40:43
42.7187 12.6008 10 2021-10-31
10:48:09
Sala Sismica INGV-Roma 97109381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-31 10:40:43 ± 0.66
Latitude 42.7187 ± 0.0414
Longitude 12.6008 ± 0.0331
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97109381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 4560
Semi-minor axis of confidence ellipse (meter) 2730
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 2
Circular confidence region, given by single value of horizontal uncertainty (meter) 4560
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 200
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.73
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.661
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 97109381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-31 10:48:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.DGI.HHZ. 2021-10-31T10:42:33.22 3.0 undecidable manual Sg 14.74 0
IV.PTCC.HHZ. 2021-10-31T10:42:32.06 3.0 undecidable manual Sg 9.89 0
GU.CANO.HHZ. 2021-10-31T10:42:29.84 3.0 undecidable manual Sn 8.62 0
IV.RESU.HHZ. 2021-10-31T10:42:20.62 3.0 undecidable manual Pg 18.889999 0
IV.CROCE.HHZ. 2021-10-31T10:42:13.70 3.0 positive manual Pn -0.01 0
IV.TEOL.HHZ. 2021-10-31T10:41:56.76 3.0 undecidable manual Sn -2.07 0
IV.PLMA.HHZ. 2021-10-31T10:41:54.75 3.0 undecidable manual Sn 0.99 0
OT.OT17.EHZ. 2021-10-31T10:41:52.48 3.0 undecidable manual Sn 3.08 0
IV.PTCC.HHZ. 2021-10-31T10:41:42.65 3.0 undecidable manual Pn 3.96 0
IV.AGLI.HHZ. 2021-10-31T10:41:41.89 3.0 undecidable manual Pg 9.12 0
IV.FREG.EHZ. 2021-10-31T10:41:41.06 3.0 undecidable manual Pg 7.95 0
IV.ZEN8.EHZ. 2021-10-31T10:41:36.89 3.0 undecidable manual Pn 4.27 0
IV.BOZZ.HNZ. 2021-10-31T10:41:31.68 3.0 positive manual Pn 3.93 0
IV.RNI2.HHZ. 2021-10-31T10:41:31.02 3.0 undecidable manual S -0.77 0
IV.RIBO.EHZ.01 2021-10-31T10:41:25.27 3.0 undecidable manual S 0.28 0
OT.OT17.EHZ. 2021-10-31T10:41:22.46 3.0 negative manual Pn 2.18 0
IV.PE3.EHZ. 2021-10-31T10:41:12.41 3.0 undecidable manual S -1.96 0
IV.CERA.HHZ. 2021-10-31T10:41:10.36 3.0 negative manual P -0.26 0
IV.PP3.EHZ. 2021-10-31T10:41:10.34 3.0 undecidable manual S -2.37 0
IV.CSP1.EHZ. 2021-10-31T10:41:05.50 0.3 undecidable manual S 50 0.5783 50 1.95 31
IV.VIVA.HHZ. 2021-10-31T10:41:02.95 3.0 positive manual P -1.22 0
IV.FOSV.EHZ. 2021-10-31T10:41:00.19 3.0 undecidable manual S -0.31 0
IV.MGAB.HHZ. 2021-10-31T10:40:59.05 0.6 undecidable manual S 299 0.4074 50 0.57 46
IV.CSP1.EHZ. 2021-10-31T10:40:56.08 0.1 undecidable manual P 50 0.5783 50 0.92 77
IV.ATMI.HHZ. 2021-10-31T10:40:56.13 0.6 negative manual P 339 0.661 50 -0.45 46
IV.ASSB.HHZ. 2021-10-31T10:40:55.44 0.3 undecidable manual S 7 0.3265 50 -0.64 69
IV.SMA1.EHZ. 2021-10-31T10:40:53.46 0.3 undecidable manual P 99 0.5468 50 -1.16 52
IV.MGAB.HHZ. 2021-10-31T10:40:52.72 0.1 undecidable manual P 299 0.4074 50 0.49 96
IV.ASSB.HHZ. 2021-10-31T10:40:50.50 0.3 undecidable manual P 7 0.3265 50 -0.35 75
IV.MOMA.HHZ. 2021-10-31T10:40:45.97 0.1 undecidable manual P 345 0.0881 136 -0.54 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:2.5 0.004135 1 AML other m 2021-10-31T10:40:46.09
IV.MOMA.HNN. ML:2.4 0.00369 0.98 AML other m 2021-10-31T10:40:46.10
IV.MOMA.HHE. ML:2.6 0.00575 0.34 AML other m 2021-10-31T10:40:46.70
IV.MOMA.HNE. ML:2.6 0.00537 0.34 AML other m 2021-10-31T10:40:46.71
IV.ASSB.HHN. ML:0.9 3.235E-5 0.5 AML other m 2021-10-31T10:40:56.61
IV.ASSB.HHE. ML:1 3.685E-5 0.34 AML other m 2021-10-31T10:40:57.31
IV.MGAB.HHN. ML:1.2 4.965E-5 0.18 AML other m 2021-10-31T10:41:00.58
IV.MGAB.HHE. ML:1 3.05E-5 0.44 AML other m 2021-10-31T10:41:02.75
IV.VIVA.HHN. ML:2.7 0.000395 1.06 AML other m 2021-10-31T10:41:09.01
IV.VIVA.HHE. ML:2.8 0.00053 1.16 AML other m 2021-10-31T10:41:10.05
IV.RNI2.HHN. ML:2.6 0.0001495 0.64 AML other m 2021-10-31T10:41:54.19
IV.RNI2.HHE. ML:2.7 0.0002025 0.06 AML other m 2021-10-31T10:41:54.23
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