Earthquake with magnitude of Md 0.9 on date 24-07-2021 and time 22:49:41 (Italy) in region 5 km W Pollina (PA)

A magnitude Md 0.9 earthquake occured in region: 5 km W Pollina (PA), on

  • 24-07-2021 20:49:41 (UTC)
  • 24-07-2021 22:49:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.991, 14.09 at 4 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
Pollina PA 5 2974 2974
Castelbuono PA 6 8943 11917
Cefal├╣ PA 8 14393 26310
Isnello PA 9 1589 27899
Gratteri PA 11 963 28862
San Mauro Castelverde PA 12 1701 30563
Lascari PA 13 3588 34151
Tusa ME 13 2925 37076
Collesano PA 15 4054 41130
Geraci Siculo PA 16 1945 43075
Campofelice di Roccella PA 18 7537 50612
Pettineo ME 18 1350 51962
Motta d'Affermo ME 19 739 52701

Municipalities with at least 50000 inhabitants

An earthquake occurred to
52 Km E of Bagheria (55387 inhabitants)
55 Km N of Caltanissetta (63360 inhabitants)
65 Km E of Palermo (674435 inhabitants)
88 Km NE of Agrigento (59770 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
Md 0.9 2021-07-24
20:49:41
37.9907 14.0897 4 2021-07-24
20:57:13
Sala Sismica INGV-Roma 93167671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-24 20:49:41 ± 0.19
Latitude 37.9907 ± 0.0045
Longitude 14.0897 ± 0.0046
Depth (km) 4 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93167671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 454
Semi-minor axis of confidence ellipse (meter) 285
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 169
Circular confidence region, given by single value of horizontal uncertainty (meter) 450
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 177
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.15828
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 4
Magnitude information

Md:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 4
Type of magnitude Md
Reference to an origin 93167671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-24 20:57:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ECTS.HHZ. 2021-07-24T20:50:09.91 3.0 undecidable manual S 0.96 0
IV.ECTS.HHZ. 2021-07-24T20:49:55.97 3.0 undecidable manual P -0.09 0
IV.PETRA.HHZ. 2021-07-24T20:49:47.86 0.6 undecidable manual S 173 0.1583 104 0.26 47
IV.PETRA.HHZ. 2021-07-24T20:49:44.96 0.3 undecidable manual P 173 0.1583 104 0.01 74
IV.CSLB.HHZ. 2021-07-24T20:49:43.88 0.3 undecidable manual S 205 0.0585 124 -0.17 73
IV.PLLN.EHZ. 2021-07-24T20:49:43.59 0.3 undecidable manual S 87 0.0423 133 0.05 75
IV.GIB.HHZ. 2021-07-24T20:49:43.93 0.3 undecidable manual S 270 0.0504 128 0.15 73
IV.GIB.HHZ. 2021-07-24T20:49:42.72 0.1 positive manual P 270 0.0504 128 -0.02 100
IV.CSLB.HHZ. 2021-07-24T20:49:42.79 0.3 undecidable manual P 205 0.0585 124 -0.11 74
IV.PLLN.EHZ. 2021-07-24T20:49:42.55 0.1 negative manual P 87 0.0423 133 -0.06 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PLLN.EHZ. Md:0.9 7 END duration s
IV.GIB.HHZ. Md:0.9 7 END duration s
IV.CSLB.HHZ. Md:0.8 6 END duration s
IV.PETRA.HHZ. Md:1.4 12 END duration s
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