Earthquake with magnitude of ML 1.6 on date 04-08-2020 and time 23:14:41 (Italy) in region 5 km SE Massa Martana (PG)

A magnitude ML 1.6 earthquake occured in region: 5 km SE Massa Martana (PG), on

  • 04-08-2020 21:14:41 (UTC)
  • 04-08-2020 23:14:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.74, 12.55 at 9 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
Massa Martana PG 5 3770 3770
Acquasparta TR 5 4778 8548
Giano dell'Umbria PG 11 3846 12394
Montecastrilli TR 11 5022 17416
Todi PG 13 16851 34267
Avigliano Umbro TR 13 2558 36825
San Gemini TR 14 5018 41843
Castel Ritaldi PG 14 3278 45121
Spoleto PG 16 38218 83339
Gualdo Cattaneo PG 19 6155 89494
Montefalco PG 19 5679 95173
Monte Castello di Vibio PG 20 1567 96740
Collazzone PG 20 3473 100213
Fratta Todina PG 20 1839 102052

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NW of Terni (111501 inhabitants)
27 Km SW of Foligno (57155 inhabitants)
43 Km SE of Perugia (166134 inhabitants)
51 Km NE of Viterbo (67173 inhabitants)
82 Km NW of L'Aquila (69753 inhabitants)
83 Km N of Guidonia Montecelio (88673 inhabitants)
89 Km N of Tivoli (56533 inhabitants)
94 Km N of Roma (2864731 inhabitants)
95 Km NE of Civitavecchia (52991 inhabitants)
95 Km W of Teramo (54892 inhabitants)
97 Km SE of Arezzo (99543 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.6 2020-08-04
21:14:41
42.74 12.55 9 2020-08-04
21:29:15
Sala Sismica INGV-Roma 81657151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-04 21:14:41 ± 0.13
Latitude 42.74 ± 0.01
Longitude 12.55 ± 0.01
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81657151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 921
Semi-minor axis of confidence ellipse (meter) 672
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 920
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 15
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) 0.78421
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 81657151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-04 21:29:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CGL.BHZ. 2020-08-04T21:16:30.48 3.0 undecidable manual Sn -4.22 0
IV.ZONE.HHZ. 2020-08-04T21:16:22.37 3.0 undecidable manual Sn -1.29 0
IV.CMPR.HHZ. 2020-08-04T21:16:11.71 3.0 undecidable manual Sg 1.27 0
MN.TIR.HHZ. 2020-08-04T21:16:07.76 3.0 negative manual Pn 1.6 0
IV.ILOS.HHZ. 2020-08-04T21:16:05.26 3.0 positive manual Pg 13.67 0
IV.SBPO.HNZ. 2020-08-04T21:16:03.13 3.0 undecidable manual Sg 1.34 0
IV.MILN.HHZ. 2020-08-04T21:15:47.25 3.0 undecidable manual Pg 6.45 0
ST.GAGG.HHZ. 2020-08-04T21:15:44.41 3.0 undecidable manual Pg 4.73 0
IV.SARZ.HHZ. 2020-08-04T21:15:44.14 3.0 undecidable manual Pg 6.99 0
GU.RORO.HHZ. 2020-08-04T21:15:36.11 3.0 negative manual Pn -2.8 0
IV.ROSPO.HHZ. 2020-08-04T21:15:34.68 3.0 undecidable manual Sn -4.47 0
IV.NDIM.HHZ. 2020-08-04T21:15:30.40 3.0 positive manual Pg 5.58 0
IV.VULT.HHZ. 2020-08-04T21:15:24.92 3.0 negative manual Pn -3.12 0
IV.FIR.HHZ. 2020-08-04T21:15:07.43 3.0 undecidable manual Pg -2.69 0
IV.EL6.EHZ. 2020-08-04T21:15:06.66 0.1 undecidable manual S 34 0.7159 50 0.9 70
IV.NRCA.HHZ. 2020-08-04T21:14:57.33 0.6 undecidable manual S 77 0.4263 50 0.16 47
IV.LAV9.HHZ. 2020-08-04T21:14:57.60 3.0 negative manual P -3.56 0
IV.TERO.HHZ. 2020-08-04T21:14:56.55 0.1 undecidable manual P 98 0.7842 50 -0.18 87
IV.MGAB.HHZ. 2020-08-04T21:14:55.52 0.6 undecidable manual S 299 0.3642 50 0.19 47
IV.EL6.EHZ. 2020-08-04T21:14:54.92 0.1 undecidable manual P 34 0.7159 50 -0.63 78
IV.ASSB.HHZ. 2020-08-04T21:14:53.65 0.3 undecidable manual S 15 0.3148 50 -0.22 71
IV.ARRO.EHZ. 2020-08-04T21:14:50.68 0.6 undecidable manual S 135 0.2257 110 -0.16 49
IV.NRCA.HHZ. 2020-08-04T21:14:50.48 0.1 undecidable manual P 77 0.4263 50 -0.12 95
IV.MGAB.HHZ. 2020-08-04T21:14:49.54 0.1 undecidable manual P 299 0.3642 50 0.01 98
IV.ASSB.HHZ. 2020-08-04T21:14:48.51 0.1 undecidable manual P 15 0.3148 50 -0.18 95
IV.ARRO.EHZ. 2020-08-04T21:14:47.24 0.6 positive manual P 135 0.2257 110 0.31 47
IV.CESX.HHZ. 2020-08-04T21:14:47.71 0.6 undecidable manual S 168 0.1331 121 0.12 50
IV.MOMA.HHZ. 2020-08-04T21:14:45.45 0.6 undecidable manual S 14 0.0674 140 -0.18 50
IV.CESX.HHZ. 2020-08-04T21:14:45.33 1.0 negative manual P 168 0.1331 121 0.26 24
IV.MOMA.HHZ. 2020-08-04T21:14:44.12 0.1 undecidable manual P 14 0.0674 140 0.19 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.9 0.00143 1.08 AML other m 2020-08-04T21:14:45.67
IV.MOMA.HNE. ML:1.9 0.00121 0.12 AML other m 2020-08-04T21:14:45.68
IV.MOMA.HHN. ML:2 0.001525 0.24 AML other m 2020-08-04T21:14:45.63
IV.MOMA.HNN. ML:1.9 0.0013395 0.24 AML other m 2020-08-04T21:14:45.64
IV.ARRO.EHE. ML:1.2 8.27E-5 0.6 AML other m 2020-08-04T21:14:52.59
IV.ARRO.EHN. ML:1.1 7.27E-5 0.46 AML other m 2020-08-04T21:14:54.08
IV.MGAB.HHN. ML:1.5 9.845E-5 0.66 AML other m 2020-08-04T21:14:56.43
IV.MGAB.HHE. ML:1.6 0.0001285 0.24 AML other m 2020-08-04T21:14:56.76
IV.NRCA.HHE. ML:1.4 8.125E-5 0.88 AML other m 2020-08-04T21:14:59.85
IV.NRCA.HHN. ML:1.4 7.51E-5 0.58 AML other m 2020-08-04T21:15:01.34
IV.VULT.HHE. ML:3.2 0.0001535 1.52 AML other m 2020-08-04T21:15:48.87
IV.NDIM.HHE. ML:3.3 0.0002825 0.1 AML other m 2020-08-04T21:15:48.56
IV.NDIM.HHN. ML:3.2 0.000264 0.12 AML other m 2020-08-04T21:15:48.46
IV.VULT.HHN. ML:3.4 0.000237 0.44 AML other m 2020-08-04T21:16:30.98
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download