Days after Nepal earthquake, traumatized villagers escape quake zone . Nepal aid mission gallery 2 . of rice and noodles aren't nearly enough to meet the needs of local people. .. dead on May 31, , when a earthquake hit Chimbote, Peru. . Destinations · Food & Drink · Play · Stay · Videos. History of earthquakes in the area. .. Table 2: Evolution of Peruvian Seismic Standards. team spent three days in Lima meeting with key authorities and four days in the field .. The health sector not only have a role to play in assessing and supporting Second Peruvian Standard (after earthquakes of Chimbote-. 2. To describe different activities involved in earthquake risk mitigation/ Table 16A. Nominal Cover to Meet Specified Period of Fire Resistance. 6 / 6. Steel. 22 large scales. • In the phase of disaster prevention satellite remote sensing can play In the Chimbote earthquake (Peru), a gigantic.
The San Andreas fault is a right-lateral strike-slip transform plate boundary between the Pacific and North America plates. The plate boundary is composed of faults that are parallel to sub-parallel to the SAF and extend from the west coast of CA to the Wasatch fault WF system in central Utah the WF runs through Salt Lake City and is expressed by the mountain range on the east side of the basin that Salt Lake City is built within.
I also place a graphical depiction of the USGS moment tensor for this fault. Without more seismicity or mapped faults to suggest otherwise, this is a reasonable interpretation. More about the CSZ can be found here. There was a good sized M 6.
I present my poster for that earthquake below. Here is my report for that earthquake. Here is the updated report. There was also a M 5. Below is my interpretive poster for this earthquake I plot the seismicity from the past month, with color representing depth and diameter representing magnitude see legend. I plot the USGS fault plane solutions moment tensors in blue and focal mechanisms in orange for the M 5. There is more material from the USGS web sites about moment tensors and focal mechanisms the beach ball symbols.
Both moment tensors and focal mechanisms are solutions to seismologic data that reveal two possible interpretations for fault orientation and sense of motion. One must use other information, like the regional tectonics, to interpret which of the two possibilities is more likely. I also include the shaking intensity contours on the map. The MMI is a qualitative measure of shaking intensity. More on the MMI scale can be found here and here. I include the slab contours plotted Hayes et al.
These are mostly based upon seismicity. The depths of the earthquakes have considerable error and do not all occur along the subduction zone faults, so these slab contours are simply the best estimate for the location of the fault. I include some inset figures.
In the upper right corner is a map of the Cascadia subduction zone CSZ and regional tectonic plate boundary faults. This is modified from several sources Chaytor et al. Below the CSZ map is an illustration modified from Plafker This figure shows how a subduction zone deforms between interseismic and during coseismic earthquakes.
However, it is useful to know this when studying the CSZ. In the lower left corner is a figure from Rollins and Stein This map shows the major earthquakes that have occurred in this region, prior to their publication in In the upper left corner is a map showing historic focal mechanisms along the MF Dengler et al. This figure shows how the GPS sites moved during that earthquake, showing that the CSZ megathrust fault is seismologically coupled. This is the report from my DYFI submission.
This video was tweeted earlier today see tweet in Social Media section below. Thanks Mike for sharing this video! Here is the Rollins and Stein figure that is in the report above. I include their figure caption as blockquote below.
Calculation depth is 5 km. Here is a large scale map of the earthquake swarm. The mainshock epicenter is a black star and epicenters are denoted as white circles. Here is a plot of focal mechanisms from the Dengler et al.
In this map below, I label a number of other significant earthquakes in this Mendocino triple junction region. These are mostly based upon seismicity.
Earthquake Report: Peru Update #1
The depths of the earthquakes have considerable error and do not all occur along the subduction zone faults, so these slab contours are simply the best estimate for the location of the fault.
However, we must await slab v 2. I include some inset figures. In the upper right corner is an updated time-space figure showing along-strike lengths for historic earthquakesalong with slip patches for some of these earthquakes Villegas-Lanza et al.
Earthquake Report: Peru Update #1 | Jay Patton online
I place a blue star in the general location of the This is the updated seismic coupling figure from Villegas-Lanza et al. Note how this M 7. Here is my initial interpretive poster. Here is my initial report, with lots more background information. Here is a comparison of the intensity modeling for these comparable earthquakes. I present the intensity maps on top with the moment tensors, labled with their strike, dip, and rake data; note how they are almost identical!
Here is the Villageas-Lanza et al. The blue ellipses indicate the locations of moderate tsunami-earthquakes [Pelayo and Wiens, ; Ihmle et al. The slab geometry isodepth contours are reported every 50 km solid lines and 10 km dashed linesbased on the Slab1.
The dashed rectangle corresponds to Figures 1b and 1c. The rupture extent values in km of historical gray and recent red megathrust earthquakes along the Peruvian margin are shown as a function of time in years. A triangle indicates if a tsunami was associated with the event.
The orange bands denote the entrance of the NR and the MFZ delimiting the northern, central, and southern Peru subduction segments. The rupture lengths were taken from its corresponding published slip models [Silgado, ; Beck and Ruff, ; Dorbath et al. Here is a figure from Villegas-Lanza et al. Moment deficit is the amount of energy absorbed into the tectonic system, from plate motions, that is stored as seismic strain to be released during earthquakes.
Regions where the fault is slipping freely aseismicseismic moment does not accumulate, so there is no moment deficit there e. The two panels on the right are their minimum and maximum seismogenic coupling maps showing the end members of their models. I explain the coupling ratiowhite to red in color on my initial earthquake report.
The key update in this paper an update to the Chlieh et al.